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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of consolidated Segment Adjusted EBITDA to net income      
Consolidated Segment Adjusted EBITDA $ 682,212 $ 778,818 $ 804,513
General and administrative (63,331) (75,087) (69,076)
Depreciation, depletion and amortization (268,981) (336,509) (323,983)
Asset impairment charge     (100,130)
Interest expense, net (39,283) (30,655) (29,693)
Acquisition gain, net     22,548
Debt extinguishment loss (8,148)    
Income tax (expense) benefit (211) (14) (21)
NET INCOME $ 302,258 $ 336,553 $ 304,158