SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Results of Operations for Natural Gas and Crude Oil Producing Activities (Unaudited) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Lease operating expenses	$ 59,950	$ 56,992	$ 42,402
Production taxes	31,410	18,443	25,615
Transportation, gathering and processing expenses	18,415	10,151	4,592
Results of Operations for Crude Oil and Natural Gas Producing Activities
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Natural gas, NGL and crude oil sales	497,353	378,713	495,562
Commodity price risk management	(125,681)	203,183	309,219
Total Revenues from Oil and Gas Producing Activities	371,672	581,896	804,781
Lease operating expenses	59,950	56,992	43,682
Production taxes	31,410	18,443	27,194
Transportation, gathering and processing expenses	18,415	10,151	8,128
Exploration Expense	4,669	1,102	948
Impairment of Oil and Gas Properties	9,973	161,620	167,280
Depreciation, Depletion and Amortization	413,105	298,760	201,656
Accretion of Asset Retirement Obligations	7,080	6,293	3,455
(Gain) loss on Sale of Properties and Equipment	(43)	(385)	(75,972)
Total Expense from Oil and Gas Producing Activities	544,559	552,976	376,371
Results of Operations of Natural Gas and Crude Oil Producing Activities, Income before Income Taxes	(172,887)	28,920	428,410
Provision for Income Taxes	64,733	(10,394)	(166,930)
Results of operations for natural gas and crude oil producing activities, excluding corporate overhead and interest costs	$ (108,154)	$ 18,526	$ 261,480