CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 169,194		$ 10,759	$ 141,655		$ 74,488
Accounts receivable	38,276		48,031
Fair value of derivative contracts	11,887		38,576
Current income tax receivable	46,174		46,174
Other current assets	12,080		6,881
Total current assets	277,611		150,421
Oil and gas properties, full cost method of accounting:
Proved	9,518,245		9,375,898
Less: accumulated depreciation, depletion and amortization	(8,960,440)		(8,603,955)
Net proved oil and gas properties	557,805		771,943
Unevaluated	425,204		440,043
Other property and equipment, net	27,968		29,289
Other assets, net	28,183		18,473
Total assets	1,316,771		1,410,169
Current liabilities:
Accounts payable to vendors	28,914		82,207
Undistributed oil and gas proceeds	5,071		5,992
Accrued interest	9,773		9,022
Fair value of derivative contracts	37		0
Asset retirement obligations	33,695		21,291
Current portion of long-term debt	288,336		0
Other current liabilities	34,793		40,712
Total current liabilities	400,619		159,224
Long-term debt	1,122,901		1,060,955
Asset retirement obligations	203,661		204,575
Other long-term liabilities	18,446		25,204
Total liabilities	1,745,627		1,449,958
Commitments and contingencies
Stockholders’ equity:
Common stock, $.01 par value; authorized 30,000,000 shares; issued 5,592,641 and 5,530,232 shares, respectively	56		55
Treasury stock (1,658 shares, at cost)	(860)		(860)
Additional paid-in capital	1,654,731		1,648,687
Accumulated deficit	(2,090,168)		(1,705,623)
Accumulated other comprehensive income	7,385	$ 18,700	17,952	$ 40,700	$ 70,800	$ 83,300
Total stockholders’ equity	(428,856)		(39,789)
Total liabilities and stockholders’ equity	$ 1,316,771		$ 1,410,169