Annual report pursuant to Section 13 and 15(d)

Condensed Consolidating Financial Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details)

v3.8.0.1
Condensed Consolidating Financial Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss) $ 156,526 $ 18,235 $ 105,936 $ 154,455 $ (240,370) $ (157,296) $ (339,776) $ (242,267) $ 435,152 $ (979,709) $ (1,224,884)
Foreign currency translation adjustment [1]                 12,519 2,119 (28,502)
Other comprehensive income (loss)                 12,519 2,119 (28,502)
Comprehensive income (loss)                 447,671 (977,590) (1,253,386)
Parent                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 435,152 (979,709) (1,224,884)
Foreign currency translation adjustment                 12,519 2,119 (28,502)
Other comprehensive income (loss)                 12,519 2,119 (28,502)
Comprehensive income (loss)                 447,671 (977,590) (1,253,386)
Guarantors                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 230,335 2,999 379
Foreign currency translation adjustment                 182 778 0
Other comprehensive income (loss)                 182 778 0
Comprehensive income (loss)                 230,517 3,777 379
Non-Guarantor                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 (2,192) (25,153) (115,564)
Foreign currency translation adjustment                 12,337 1,341 (28,502)
Other comprehensive income (loss)                 12,337 1,341 (28,502)
Comprehensive income (loss)                 10,145 (23,812) (144,066)
Eliminations                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 (228,143) 22,154 115,185
Foreign currency translation adjustment                 (12,519) (2,119) 28,502
Other comprehensive income (loss)                 (12,519) (2,119) 28,502
Comprehensive income (loss)                 $ (240,662) $ 20,035 $ 143,687
[1] Net of $1.3 million in taxes for the year ended December 31, 2016. No taxes were recorded for the years ended December 31, 2017 and December 31, 2015.