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, 2019
Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 617,355 $ 630,797
Net cash provided by (used in) investing activities (638,648) (554,586)
Net cash (used in) provided by financing activities (20,880) (51,197)
Net (decrease) increase in cash, cash equivalents and restricted cash (42,173) 25,014
Cash, cash equivalents and restricted cash at beginning of period 52,297 99,557
Cash, cash equivalents and restricted cash at end of period 10,124 124,571
Reportable legal entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (7,604) 427,351
Net cash provided by (used in) investing activities 9,178 (354,848)
Net cash (used in) provided by financing activities (20,880) (51,197)
Net (decrease) increase in cash, cash equivalents and restricted cash (19,306) 21,306
Cash, cash equivalents and restricted cash at beginning of period 25,585 67,908
Cash, cash equivalents and restricted cash at end of period 6,279 89,214
Reportable legal entities | Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 621,511 203,446
Net cash provided by (used in) investing activities (644,507) (199,738)
Net cash (used in) provided by financing activities 0 0
Net (decrease) increase in cash, cash equivalents and restricted cash (22,996) 3,708
Cash, cash equivalents and restricted cash at beginning of period 26,711 31,649
Cash, cash equivalents and restricted cash at end of period 3,715 35,357
Reportable legal entities | Non-Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 3,445 (1)
Net cash provided by (used in) investing activities (3,751) (2,318)
Net cash (used in) provided by financing activities 435 2,319
Net (decrease) increase in cash, cash equivalents and restricted cash 129 0
Cash, cash equivalents and restricted cash at beginning of period 1 0
Cash, cash equivalents and restricted cash at end of period 130 0
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 3 1
Net cash provided by (used in) investing activities 432 2,318
Net cash (used in) provided by financing activities (435) (2,319)
Net (decrease) increase 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