CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 23,474	$ 17,650
Accounts receivable, net of allowance for doubtful accounts	194,403	62,978
Derivative assets	3,830	11,292
Deferred income taxes	6,065	0
Other current assets	5,924	4,595
Total current assets	233,696	96,515
Property and equipment, net (successful efforts method)	2,237,304	1,723,359
Derivative assets	1,552	5,181
Other assets	34,535	17,934
Total assets	2,507,087	1,842,989
Current liabilities
Accounts payable and accrued liabilities	248,004	111,655
Derivative liabilities	10,141	0
Deferred income taxes	0	370
Total current liabilities	258,145	112,025
Other liabilities	33,386	28,901
Derivative liabilities	0	1,421
Deferred income taxes	145,752	210,767
Long-term debt	1,281,000	594,759
Commitments and contingencies (Note 12)
Shareholders’ equity:
Preferred stock of $100 par value – 100,000 shares authorized; 11,500 shares issued as of December 31, 2013 and December 31, 2012 with a redemption value of $10,000 per share	1,150	1,150
Common stock of $0.01 par value – 128,000,000 shares authorized; shares issued of 65,306,748 and 55,117,346 as of December 31, 2013 and December 31, 2012, respectively	466	364
Paid-in capital	891,351	849,046
Retained earnings (Accumulated deficit)	(104,180)	45,790
Deferred compensation obligation	2,792	3,111
Accumulated other comprehensive income (loss)	267	(982)
Treasury stock – 233,063 and 218,320 shares of common stock, at cost, as of December 31, 2013 and December 31, 2012, respectively	(3,042)	(3,363)
Total shareholders’ equity	788,804	895,116
Total liabilities and shareholders’ equity	$ 2,507,087	$ 1,842,989