CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 3,859	$ 6,252
Accounts receivable, net of allowance for doubtful accounts	149,929	189,627
Derivative assets	118,409	128,981
Deferred Tax Assets, Net of Valuation Allowance, Current	0	53
Other current assets	9,687	10,114
Total current assets	281,884	335,027
Property and equipment, net (successful efforts method)	1,880,612	1,825,098
Derivative assets	31,844	35,897
Other assets	4,311	4,218
Total assets	2,198,651	2,200,240
Current liabilities
Accounts payable and accrued liabilities	245,066	312,227
Derivative liabilities	0	0
Total current liabilities	245,066	312,227
Other liabilities	123,524	123,886
Deferred income taxes	4,587	4,504
Long-term debt, net of unamortized issuance costs	1,211,910	1,083,806
Commitments and contingencies (Note 12)
Shareholders’ equity:
Preferred stock of $100 par value – 100,000 shares authorized; Series A – 7,945 shares issued as of March 31, 2015 and December 31, 2014 and Series B – 32,500 shares issued as of March 31, 2015 and December 31, 2014, each with a redemption value of $10,000 per share	4,044	4,044
Common stock of $0.01 par value – 128,000,000 shares authorized; 71,594,960 and 71,568,936 shares issued as of March 31, 2015 and December 31, 2014, respectively	529	529
Paid-in capital	1,207,294	1,206,305
Accumulated deficit	(598,408)	(535,176)
Deferred compensation obligation	3,267	3,211
Accumulated other comprehensive income	238	249
Treasury stock – 273,564 and 262,070 shares of common stock, at cost, as of March 31, 2015 and December 31, 2014, respectively	(3,400)	(3,345)
Total shareholders’ equity	613,564	675,817
Total liabilities and shareholders’ equity	$ 2,198,651	$ 2,200,240