CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 26,532	$ 11,955
Accounts receivable, net of allowance for doubtful accounts	43,837	47,965
Derivative assets	49,030	97,956
Other current assets	4,495	7,104
Total current assets	123,894	164,980
Property and equipment, net (successful efforts method)	334,506	344,395
Other assets	8,103	8,350
Total assets	466,503	517,725
Current liabilities
Accounts payable and accrued liabilities	110,353	103,525
Long-term Debt, Current Maturities	1,202,492	1,224,383
Total current liabilities	1,312,845	1,327,908
Other liabilities	$ 102,880	$ 104,938
Commitments and contingencies (Note 12)
Shareholders’ deficit:
Preferred stock of $100 par value – 100,000 shares authorized; Series A – 3,864 and 3,915 shares issued as of March 31, 2016 and December 31, 2015, respectively, and Series B – 17,152 and 27,551issued as of March 31, 2016 and December 31, 2015, each with a redemption value of $10,000 per share	$ 2,102	$ 3,146
Common stock of $0.01 par value – 228,000,000 shares authorized; 87,008,148 and 81,252,676 shares issued as of March 31, 2016 and December 31, 2015, respectively	685	628
Paid-in capital	1,211,474	1,211,088
Accumulated deficit	(2,163,744)	(2,130,271)
Deferred compensation obligation	3,440	3,440
Accumulated other comprehensive income	395	422
Treasury stock – 455,689 and 455,689 shares of common stock, at cost, as of March 31, 2016 and December 31, 2015, respectively	(3,574)	(3,574)
Total shareholders’ deficit	(949,222)	(915,121)
Total liabilities and shareholders’ deficit	$ 466,503	$ 517,725