CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 3,342	$ 6,252
Accounts receivable, net of allowance for doubtful accounts	73,020	189,627
Derivative assets	96,211	128,981
Deferred income taxes	0	53
Other current assets	7,302	10,114
Total current assets	179,875	335,027
Property and equipment, net (successful efforts method)	1,818,586	1,825,098
Derivative assets	16,149	35,897
Other assets	5,836	5,841
Total assets	2,020,446	2,201,863
Current liabilities
Accounts payable and accrued liabilities	161,908	312,227
Derivative liabilities	0	0
Total current liabilities	161,908	312,227
Other liabilities	105,237	123,886
Deferred income taxes	4,868	4,504
Long-term debt, net of unamortized issuance costs	$ 1,193,362	$ 1,085,429
Commitments and contingencies (Note 12)
Shareholders’ equity:
Preferred stock of $100 par value – 100,000 shares authorized; Series A – 7,070 shares and 7,945 shares issued as of September 30, 2015 and December 31, 2014, respectively, and Series B – 32,500 shares issued as of September 30, 2015 and December 31, 2014, each with a redemption value of $10,000 per share	$ 3,957	$ 4,044
Common stock of $0.01 par value – 228,000,000 shares authorized; 73,297,205 and 71,568,936 shares issued as of September 30, 2015 and December 31, 2014, respectively	548	529
Paid-in capital	1,209,187	1,206,305
Accumulated deficit	(658,704)	(535,176)
Deferred compensation obligation	3,440	3,211
Accumulated other comprehensive income	217	249
Treasury stock – 455,689 and 262,070 shares of common stock, at cost, as of September 30, 2015 and December 31, 2014, respectively	(3,574)	(3,345)
Total shareholders’ equity	555,071	675,817
Total liabilities and shareholders’ equity	$ 2,020,446	$ 2,201,863