Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information (Condensed Consolidating Statements of Cash Flows (Details))

v3.8.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Statements of Cash Flows (Details)) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 226,349 $ 142,645
Net cash (used in) provided by investing activities (306,871) (1,532,679)
Net cash provided by (used in) financing activities 99,578 31,644
Net increase (decrease) in cash, cash equivalents and restricted cash 19,056 (1,358,390)
Cash, cash equivalents and restricted cash at beginning of period 99,557 1,460,875
Cash, cash equivalents and restricted cash at end of period 118,613 102,485
Reportable Legal Entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 144,895 139,260
Net cash (used in) provided by investing activities (231,024) (1,557,852)
Net cash provided by (used in) financing activities 99,578 31,644
Net increase (decrease) in cash, cash equivalents and restricted cash 13,449 (1,386,948)
Cash, cash equivalents and restricted cash at beginning of period 67,908 1,458,882
Cash, cash equivalents and restricted cash at end of period 81,357 71,934
Reportable Legal Entities | Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 81,452 3,384
Net cash (used in) provided by investing activities (75,847) (1,348,964)
Net cash provided by (used in) financing activities 0 1,374,137
Net increase (decrease) in cash, cash equivalents and restricted cash 5,605 28,557
Cash, cash equivalents and restricted cash at beginning of period 31,649 1,993
Cash, cash equivalents and restricted cash at end of period 37,254 30,550
Reportable Legal Entities | Non-Guarantor    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 1 1
Net cash (used in) provided by investing activities (1,569) (673)
Net cash provided by (used in) financing activities 1,570 673
Net increase (decrease) in cash, cash equivalents and restricted cash 2 1
Cash, cash equivalents and restricted cash at beginning of period 0 0
Cash, cash equivalents and restricted cash at end of period 2 1
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 1 0
Net cash (used in) provided by investing activities 1,569 1,374,810
Net cash provided by (used in) financing activities (1,570) (1,374,810)
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0
Cash, cash equivalents and restricted cash at beginning of period 0 0
Cash, cash equivalents and restricted cash at end of period $ 0 $ 0