CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 10,759	$ 74,488	$ 331,224	$ 279,526
Restricted cash	0	177,647
Accounts receivable	48,031	120,359
Fair value of derivative contracts	38,576	139,179
Current income tax receivable	46,174	7,212
Inventory	535	3,709
Other current assets	6,346	8,118
Total current assets	150,421	530,712
Oil and gas properties, full cost method of accounting:
Proved	9,375,898	8,817,268
Less: accumulated depreciation, depletion and amortization	(8,603,955)	(6,970,631)
Net proved oil and gas properties	771,943	1,846,637
Unevaluated	440,043	567,365
Other property and equipment, net of accumulated depreciation of $27,424 and $24,091, respectively	29,289	32,340
Fair value of derivative contracts	0	14,333
Other assets, net of accumulated depreciation and amortization of $4,376 and $3,560, respectively	18,473	18,470
Total assets	1,410,169	3,009,857
Current liabilities:
Accounts payable to vendors	82,207	132,629
Undistributed oil and gas proceeds	5,992	23,232
Accrued interest	9,022	9,022
Deferred taxes	0	20,119
Asset retirement obligations	21,291	69,400
Other current liabilities	40,712	49,505
Total current liabilities	159,224	303,907
Long-term debt	1,060,955	1,032,281
Deferred taxes	0	286,343
Asset retirement obligations	204,575	247,009
Other long-term liabilities	25,204	38,714
Total liabilities	$ 1,449,958	$ 1,908,254
Commitments and contingencies
Stockholders’ equity:
Common stock, $.01 par value; authorized 150,000,000 shares; issued 55,302,325 and 54,884,542 shares, respectively	$ 553	$ 549
Treasury stock (16,582 shares, at cost)	(860)	(860)
Additional paid-in capital	1,648,189	1,633,307
Accumulated deficit	(1,705,623)	(614,708)
Accumulated other comprehensive income	17,952	83,315	$ (2,062)	$ 28,833
Total stockholders’ equity	(39,789)	1,101,603
Total liabilities and stockholders’ equity	$ 1,410,169	$ 3,009,857