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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reconciliation of consolidated Segment Adjusted EBITDA to net income    
Consolidated Segment Adjusted EBITDA $ 193,615 $ 142,652
General and administrative (16,447) (17,553)
Depreciation, depletion and amortization (65,127) (70,607)
Interest expense, net (7,491) (7,611)
Income tax benefit 12 8
NET INCOME $ 104,562 $ 46,889