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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of consolidated Segment Adjusted EBITDA to net income        
Consolidated Segment Adjusted EBITDA $ 155,928 $ 181,736 $ 349,543 $ 324,388
General and administrative (15,324) (18,635) (31,771) (36,188)
Depreciation, depletion and amortization (59,020) (73,697) (124,147) (144,304)
Interest expense, net (10,559) (7,766) (18,050) (15,377)
Debt extinguishment loss (8,148)   (8,148)  
Income tax benefit (5) (6) 7 2
NET INCOME $ 62,872 $ 81,632 $ 167,434 $ 128,521