Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Cash Flows) (Details)

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CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Cash Flows) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 608,956 $ 491,733
Net cash (used in) provided by investing activities (532,745) (2,181,480)
Net cash (used in) provided by financing activities (51,197) 354,143
Net increase (decrease) in cash, cash equivalents and restricted cash 25,014 (1,335,604)
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 124,571 125,271
Reportable legal entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 416,833 310,624
Net cash (used in) provided by investing activities (344,330) (2,034,554)
Net cash (used in) provided by financing activities (51,197) 354,143
Net increase (decrease) in cash, cash equivalents and restricted cash 21,306 (1,369,787)
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 89,214 89,095
Reportable legal entities | Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 192,123 181,108
Net cash (used in) provided by investing activities (188,415) (1,554,063)
Net cash (used in) provided by financing activities 0 1,407,137
Net increase (decrease) in cash, cash equivalents and restricted cash 3,708 34,182
Cash, cash equivalents and restricted cash at beginning of period 31,649 1,993
Cash, cash equivalents and restricted cash at end of period 35,357 36,175
Reportable legal entities | Non-Guarantor    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (1) (1)
Net cash (used in) provided by investing activities (2,318) (1,843)
Net cash (used in) provided by financing activities 2,319 1,845
Net increase (decrease) in cash, cash equivalents and restricted cash 0 1
Cash, cash equivalents and restricted cash at beginning of period 0 0
Cash, cash equivalents and restricted cash at end of period 0 1
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 1 2
Net cash (used in) provided by investing activities 2,318 1,408,980
Net cash (used in) provided by financing activities (2,319) (1,408,982)
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