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CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Cash Flows) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 247,222 $ 399,769
Net cash used in investing activities (230,090) (510,225)
Net cash (used in) provided by financing activities (20,375) 78,936
Net (decrease) increase in cash, cash equivalents and restricted cash (3,243) (31,520)
Cash, cash equivalents and restricted cash at beginning of period 6,060 52,297
Cash, cash equivalents and restricted cash at end of period 2,817 20,777
Reportable legal entities | Parent    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 18,854 312,267
Net cash used in investing activities (424) (405,848)
Net cash (used in) provided by financing activities (20,375) 78,936
Net (decrease) increase in cash, cash equivalents and restricted cash (1,945) (14,645)
Cash, cash equivalents and restricted cash at beginning of period 2,768 25,585
Cash, cash equivalents and restricted cash at end of period 823 10,940
Reportable legal entities | Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 228,317 84,146
Net cash used in investing activities (229,666) (101,058)
Net cash (used in) provided by financing activities 0 0
Net (decrease) increase in cash, cash equivalents and restricted cash (1,349) (16,912)
Cash, cash equivalents and restricted cash at beginning of period 3,097 26,711
Cash, cash equivalents and restricted cash at end of period 1,748 9,799
Reportable legal entities | Non-Guarantors    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (384) 3,355
Net cash used in investing activities 0 (3,751)
Net cash (used in) provided by financing activities 435 433
Net (decrease) increase in cash, cash equivalents and restricted cash 51 37
Cash, cash equivalents and restricted cash at beginning of period 195 1
Cash, cash equivalents and restricted cash at end of period 246 38
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 435 1
Net cash used in investing activities 0 432
Net cash (used in) provided by financing activities (435) (433)
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