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
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 308,989 $ 411,044
Net cash (used in) provided by investing activities (419,445) (360,465)
Net cash provided by (used in) financing activities 78,936 (30,906)
Net (decrease) increase in cash, cash equivalents and restricted cash (31,520) 19,673
Cash, cash equivalents and restricted cash at beginning of period 52,297 99,557
Cash, cash equivalents and restricted cash at end of period 20,777 119,230
Reportable legal entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 230,776 370,965
Net cash (used in) provided by investing activities (324,357) (327,362)
Net cash provided by (used in) financing activities 78,936 (30,906)
Net (decrease) increase in cash, cash equivalents and restricted cash (14,645) 12,697
Cash, cash equivalents and restricted cash at beginning of period 25,585 67,908
Cash, cash equivalents and restricted cash at end of period 10,940 80,605
Reportable legal entities | Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 74,857 40,078
Net cash (used in) provided by investing activities (91,769) (33,103)
Net cash provided by (used in) financing activities 0 0
Net (decrease) increase in cash, cash equivalents and restricted cash (16,912) 6,975
Cash, cash equivalents and restricted cash at beginning of period 26,711 31,649
Cash, cash equivalents and restricted cash at end of period 9,799 38,624
Reportable legal entities | Non-Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 3,355 0
Net cash (used in) provided by investing activities (3,751) (1,569)
Net cash provided by (used in) financing activities 433 1,570
Net (decrease) increase in cash, cash equivalents and restricted cash 37 1
Cash, cash equivalents and restricted cash at beginning of period 1 0
Cash, cash equivalents and restricted cash at end of period 38 1
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 1 1
Net cash (used in) provided by investing activities 432 1,569
Net cash provided by (used in) financing activities (433) (1,570)
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