CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 11,941	$ 11,557
Accounts receivable:
Oil and gas sales	56,843	69,161
Joint interest billing	28,550	42,407
Other	20,157	22,193
Commodity derivative contracts	95,473	126,709
Other current assets	2,119	1,098
Total current assets	215,083	273,125
PROPERTY AND EQUIPMENT:
Oil and gas properties, on the basis of full cost accounting	3,532,976	3,442,681
Other property and equipment	13,845	13,454
Less accumulated depreciation, depletion, amortization and impairment	(1,566,043)	(1,333,019)
Net property and equipment	1,980,778	2,123,116
OTHER ASSETS:
Deferred income taxes	33,119	35,821
Other noncurrent assets	42,619	43,731
Total other assets	75,738	79,552
TOTAL	2,271,599	2,475,793
CURRENT LIABILITIES:
Accounts payable	24,006	22,783
Accrued liabilities	182,488	183,831
Deferred income taxes	33,119	44,862
Total current liabilities	239,613	251,476
LONG-TERM LIABILITIES:
Asset retirement obligations	22,044	21,599
Long-term debt	1,735,150	1,735,150
Other long-term liabilities	1,486	1,706
Total long-term liabilities	1,758,680	1,758,455
COMMITMENTS AND CONTINGENCIES (Note 15)
STOCKHOLDERS' EQUITY
Preferred stock
Common stock, $0.01 parvalue, 300,000,000 shares authorized; 72,440,407 shares issued and 71,650,849 shares outstanding at March 31, 2015 and 70,491,732 shares issued and 69,957,055, shares outstanding at December 31, 2014	724	704
Treasury stock	(2,897)	(2,592)
Additional paid-in-capital	883,177	881,894
Retained deficit	(607,701)	(414,147)
Total stockholders' equity	273,306	465,862
TOTAL	2,271,599	2,475,793
Series A Preferred Stock
STOCKHOLDERS' EQUITY
Preferred stock	3	3
Total stockholders' equity	$ 3	$ 3