Annual report pursuant to Section 13 and 15(d)

Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details)

v3.8.0.1
Condensed Consolidating Financial Information - Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 679,889 $ 337,843 $ 322,179
Net cash (used in) provided by investing activities (2,289,168) (905,582) (1,574,253)
Net cash provided by (used in) financing activities 432,961 1,730,640 1,222,708
Net (decrease) increase in cash and cash equivalents (1,176,318) 1,162,901 (29,366)
Cash and cash equivalents at beginning of period 1,275,875 112,974 142,340
Cash and cash equivalents at end of period 99,557 1,275,875 112,974
Parent      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 392,680 336,330 344,018
Net cash (used in) provided by investing activities (2,031,615) (905,582) (1,595,767)
Net cash provided by (used in) financing activities 432,961 1,730,640 1,222,708
Net (decrease) increase in cash and cash equivalents (1,205,974) 1,161,388 (29,041)
Cash and cash equivalents at beginning of period 1,273,882 112,494 141,535
Cash and cash equivalents at end of period 67,908 1,273,882 112,494
Guarantors      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 287,209 (9,486) (21,839)
Net cash (used in) provided by investing activities (1,674,690) (22,500) 21,514
Net cash provided by (used in) financing activities 1,417,137 33,500 0
Net (decrease) increase in cash and cash equivalents 29,656 1,514 (325)
Cash and cash equivalents at beginning of period 1,993 479 804
Cash and cash equivalents at end of period 31,649 1,993 479
Non-Guarantor      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 0 (2) (2)
Net cash (used in) provided by investing activities (2,280) (15,472) (14,472)
Net cash provided by (used in) financing activities 2,280 15,473 14,474
Net (decrease) increase in cash and cash equivalents 0 (1) 0
Cash and cash equivalents at beginning of period 0 1 1
Cash and cash equivalents at end of period 0 0 1
Eliminations      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 0 11,001 2
Net cash (used in) provided by investing activities 1,419,417 37,972 14,472
Net cash provided by (used in) financing activities (1,419,417) (48,973) (14,474)
Net (decrease) increase in cash and cash equivalents 0 0 0
Cash and cash equivalents at beginning of period 0 0 0
Cash and cash equivalents at end of period $ 0 $ 0 $ 0