Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Current assets: |
|
|
|
|
Cash and cash equivalents |
$ 6,060
|
$ 52,297
|
|
|
Accounts receivable—oil and natural gas sales |
121,210
|
210,200
|
|
|
Accounts receivable - joint interest and other |
47,975
|
22,497
|
|
|
Accounts receivable - intercompany |
0
|
0
|
|
|
Prepaid expenses and other current assets |
4,431
|
10,017
|
|
|
Total short-term derivative instruments – asset |
126,201
|
21,352
|
|
|
Total current assets |
305,877
|
316,363
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
10,595,735
|
10,026,836
|
|
|
Other property and equipment |
96,719
|
92,667
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(7,228,660)
|
(4,640,098)
|
|
|
Property and equipment, net |
3,463,794
|
5,479,405
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
32,044
|
236,121
|
|
|
Long-term derivative instruments |
563
|
0
|
|
|
Deferred tax asset |
7,563
|
0
|
|
|
Inventories |
5,182
|
5,344
|
|
|
Operating lease assets |
14,168
|
0
|
|
|
Operating lease assets - related parties |
43,270
|
0
|
|
|
Other assets |
10,358
|
13,803
|
|
|
Total other assets |
113,148
|
255,268
|
|
|
Total assets |
3,882,819
|
6,051,036
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
415,218
|
518,380
|
|
|
Accounts payable - intercompany |
0
|
0
|
|
|
Short-term derivative instruments |
303
|
20,401
|
|
|
Current portion of operating lease liabilities |
13,826
|
0
|
|
|
Current portion of operating lease liabilities - related parties |
21,220
|
0
|
|
|
Current maturities of long-term debt |
631
|
651
|
|
|
Total current liabilities |
451,198
|
539,432
|
|
|
Long-term derivative instruments |
53,135
|
13,992
|
|
|
Asset retirement obligation—long-term |
60,355
|
79,952
|
|
|
Uncertain tax position liability |
3,127
|
3,127
|
|
|
Non-current operating lease liabilities |
342
|
0
|
|
|
Non-current operating lease liabilities - related parties |
22,050
|
0
|
|
|
Long-term debt, net of current maturities |
1,978,020
|
2,086,765
|
|
|
Total liabilities |
2,568,227
|
2,723,268
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
1,597
|
1,630
|
|
|
Paid-in capital |
4,207,554
|
4,227,532
|
|
|
Accumulated other comprehensive loss |
(46,833)
|
(56,026)
|
|
|
Accumulated deficit |
(2,847,726)
|
(845,368)
|
|
|
Total stockholders’ equity |
1,314,592
|
3,327,768
|
$ 3,101,614
|
$ 2,183,892
|
Total liabilities and stockholders’ equity |
3,882,819
|
6,051,036
|
|
|
Eliminations |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
0
|
0
|
|
|
Accounts receivable—oil and natural gas sales |
|
0
|
|
|
Accounts receivable - joint interest and other |
0
|
0
|
|
|
Accounts receivable - intercompany |
(1,908,816)
|
(991,097)
|
|
|
Prepaid expenses and other current assets |
0
|
0
|
|
|
Total short-term derivative instruments – asset |
0
|
0
|
|
|
Total current assets |
(1,908,816)
|
(991,097)
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
(729)
|
(729)
|
|
|
Other property and equipment |
0
|
0
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
0
|
0
|
|
|
Property and equipment, net |
(729)
|
(729)
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
(3,059,791)
|
(2,665,126)
|
|
|
Long-term derivative instruments |
0
|
|
|
|
Deferred tax asset |
0
|
|
|
|
Inventories |
0
|
0
|
|
|
Operating lease assets |
0
|
|
|
|
Operating lease assets - related parties |
0
|
|
|
|
Other assets |
|
1
|
|
|
Total other assets |
(3,059,791)
|
(2,665,125)
|
|
|
Total assets |
(4,969,336)
|
(3,656,951)
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
|
0
|
|
|
Accounts payable - intercompany |
(1,908,817)
|
(991,097)
|
|
|
Short-term derivative instruments |
0
|
0
|
|
|
Current portion of operating lease liabilities |
0
|
|
|
|
Current portion of operating lease liabilities - related parties |
0
|
|
|
|
Current maturities of long-term debt |
0
|
0
|
|
|
Total current liabilities |
(1,908,817)
|
(991,097)
|
|
|
Long-term derivative instruments |
0
|
0
|
|
|
Asset retirement obligation—long-term |
0
|
0
|
|
|
Uncertain tax position liability |
0
|
0
|
|
|
Non-current operating lease liabilities |
0
|
|
|
|
Non-current operating lease liabilities - related parties |
0
|
|
|
|
Long-term debt, net of current maturities |
0
|
0
|
|
|
Total liabilities |
(1,908,817)
|
(991,097)
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
0
|
0
|
|
|
Paid-in capital |
(4,438,965)
|
(2,177,224)
|
|
|
Accumulated other comprehensive loss |
44,763
|
53,783
|
|
|
Accumulated deficit |
1,333,683
|
(542,413)
|
|
|
Total stockholders’ equity |
(3,060,519)
|
(2,665,854)
|
|
|
Total liabilities and stockholders’ equity |
(4,969,336)
|
(3,656,951)
|
|
|
Parent |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
2,768
|
25,585
|
|
|
Accounts receivable—oil and natural gas sales |
859
|
146,075
|
|
|
Accounts receivable - joint interest and other |
5,279
|
16,212
|
|
|
Accounts receivable - intercompany |
1,065,593
|
671,633
|
|
|
Prepaid expenses and other current assets |
4,047
|
7,843
|
|
|
Total short-term derivative instruments – asset |
126,201
|
21,352
|
|
|
Total current assets |
1,204,747
|
888,700
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
1,314,933
|
7,044,550
|
|
|
Other property and equipment |
92,650
|
91,916
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(1,418,888)
|
(4,640,059)
|
|
|
Property and equipment, net |
(11,305)
|
2,496,407
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
3,064,503
|
2,856,988
|
|
|
Long-term derivative instruments |
563
|
|
|
|
Deferred tax asset |
7,563
|
|
|
|
Inventories |
0
|
4,210
|
|
|
Operating lease assets |
14,168
|
|
|
|
Operating lease assets - related parties |
43,270
|
|
|
|
Other assets |
10,026
|
12,624
|
|
|
Total other assets |
3,140,093
|
2,873,822
|
|
|
Total assets |
4,333,535
|
6,258,929
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
48,006
|
419,107
|
|
|
Accounts payable - intercompany |
878,283
|
320,259
|
|
|
Short-term derivative instruments |
303
|
20,401
|
|
|
Current portion of operating lease liabilities |
13,826
|
|
|
|
Current portion of operating lease liabilities - related parties |
21,220
|
|
|
|
Current maturities of long-term debt |
631
|
651
|
|
|
Total current liabilities |
962,269
|
760,418
|
|
|
Long-term derivative instruments |
53,135
|
13,992
|
|
|
Asset retirement obligation—long-term |
0
|
66,859
|
|
|
Uncertain tax position liability |
3,127
|
3,127
|
|
|
Non-current operating lease liabilities |
342
|
|
|
|
Non-current operating lease liabilities - related parties |
22,050
|
|
|
|
Long-term debt, net of current maturities |
1,978,020
|
2,086,765
|
|
|
Total liabilities |
3,018,943
|
2,931,161
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
1,597
|
1,630
|
|
|
Paid-in capital |
4,207,554
|
4,227,532
|
|
|
Accumulated other comprehensive loss |
(46,833)
|
(56,026)
|
|
|
Accumulated deficit |
(2,847,726)
|
(845,368)
|
|
|
Total stockholders’ equity |
1,314,592
|
3,327,768
|
|
|
Total liabilities and stockholders’ equity |
4,333,535
|
6,258,929
|
|
|
Guarantors |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
3,097
|
26,711
|
|
|
Accounts receivable—oil and natural gas sales |
120,351
|
64,125
|
|
|
Accounts receivable - joint interest and other |
42,696
|
6,285
|
|
|
Accounts receivable - intercompany |
843,223
|
319,464
|
|
|
Prepaid expenses and other current assets |
308
|
2,174
|
|
|
Total short-term derivative instruments – asset |
0
|
0
|
|
|
Total current assets |
1,009,675
|
418,759
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
9,273,681
|
2,983,015
|
|
|
Other property and equipment |
50
|
751
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(5,808,254)
|
(39)
|
|
|
Property and equipment, net |
3,465,477
|
2,983,727
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
6,332
|
0
|
|
|
Long-term derivative instruments |
0
|
|
|
|
Deferred tax asset |
0
|
|
|
|
Inventories |
5,182
|
1,134
|
|
|
Operating lease assets |
0
|
|
|
|
Operating lease assets - related parties |
0
|
|
|
|
Other assets |
332
|
1,178
|
|
|
Total other assets |
11,846
|
2,312
|
|
|
Total assets |
4,486,998
|
3,404,798
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
367,088
|
99,273
|
|
|
Accounts payable - intercompany |
1,026,249
|
670,708
|
|
|
Short-term derivative instruments |
0
|
0
|
|
|
Current portion of operating lease liabilities |
0
|
|
|
|
Current portion of operating lease liabilities - related parties |
0
|
|
|
|
Current maturities of long-term debt |
0
|
0
|
|
|
Total current liabilities |
1,393,337
|
769,981
|
|
|
Long-term derivative instruments |
0
|
0
|
|
|
Asset retirement obligation—long-term |
58,322
|
13,093
|
|
|
Uncertain tax position liability |
0
|
0
|
|
|
Non-current operating lease liabilities |
0
|
|
|
|
Non-current operating lease liabilities - related parties |
0
|
|
|
|
Long-term debt, net of current maturities |
0
|
0
|
|
|
Total liabilities |
1,451,659
|
783,074
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
0
|
0
|
|
|
Paid-in capital |
4,171,408
|
1,915,598
|
|
|
Accumulated other comprehensive loss |
0
|
0
|
|
|
Accumulated deficit |
(1,136,069)
|
706,126
|
|
|
Total stockholders’ equity |
3,035,339
|
2,621,724
|
|
|
Total liabilities and stockholders’ equity |
4,486,998
|
3,404,798
|
|
|
Non-Guarantor |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
195
|
1
|
|
|
Accounts receivable—oil and natural gas sales |
0
|
0
|
|
|
Accounts receivable - joint interest and other |
0
|
0
|
|
|
Accounts receivable - intercompany |
0
|
0
|
|
|
Prepaid expenses and other current assets |
76
|
0
|
|
|
Total short-term derivative instruments – asset |
0
|
0
|
|
|
Total current assets |
271
|
1
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties, full-cost accounting |
7,850
|
0
|
|
|
Other property and equipment |
4,019
|
0
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(1,518)
|
0
|
|
|
Property and equipment, net |
10,351
|
0
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
21,000
|
44,259
|
|
|
Long-term derivative instruments |
0
|
|
|
|
Deferred tax asset |
0
|
|
|
|
Inventories |
0
|
0
|
|
|
Operating lease assets |
0
|
|
|
|
Operating lease assets - related parties |
0
|
|
|
|
Other assets |
|
0
|
|
|
Total other assets |
21,000
|
44,259
|
|
|
Total assets |
31,622
|
44,260
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
124
|
0
|
|
|
Accounts payable - intercompany |
4,285
|
130
|
|
|
Short-term derivative instruments |
0
|
0
|
|
|
Current portion of operating lease liabilities |
0
|
|
|
|
Current portion of operating lease liabilities - related parties |
0
|
|
|
|
Current maturities of long-term debt |
0
|
0
|
|
|
Total current liabilities |
4,409
|
130
|
|
|
Long-term derivative instruments |
0
|
0
|
|
|
Asset retirement obligation—long-term |
2,033
|
0
|
|
|
Uncertain tax position liability |
0
|
0
|
|
|
Non-current operating lease liabilities |
0
|
|
|
|
Non-current operating lease liabilities - related parties |
0
|
|
|
|
Long-term debt, net of current maturities |
0
|
0
|
|
|
Total liabilities |
6,442
|
130
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
0
|
0
|
|
|
Paid-in capital |
267,557
|
261,626
|
|
|
Accumulated other comprehensive loss |
(44,763)
|
(53,783)
|
|
|
Accumulated deficit |
(197,614)
|
(163,713)
|
|
|
Total stockholders’ equity |
25,180
|
44,130
|
|
|
Total liabilities and stockholders’ equity |
$ 31,622
|
$ 44,260
|
|
|