Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property and Equipment
Proved oil and gas properties	$ 5,997,030	$ 5,972,666
Unproved oil and gas properties	18,839	18,839
Furniture, fixtures, and other equipment	44,252	44,252
Less - Accumulated depreciation, depletion, and amortization	(5,673,015)	(5,577,854)
Property and Equipment, Net	387,106	457,903
Accounts Payable and Accrued Liabilities
Trade accounts payable	24,731	0
Accrued operating expenses	3,775	0
Accrued payroll costs	4,059	0
Asset retirement obligation - current portion	7,719	7,165
Accrued taxes	3,022	0
Other payables	17,320	498
Total accounts payable and accrued liabilities	$ 60,626	$ 7,663