Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 298,488	$ 2,457
Restricted cash	3,950	3,942
Accounts receivable, net	56,181	64,880
Accounts receivable affiliates	4,784	4,842
Fair value of derivatives	9,660	52,042
Deferred income taxes	22,238	36,151
Prepaid expenses and other current assets	9,073	7,635
Total current assets	404,374	171,949
Properties and equipment, net	1,539,701	1,616,706
Assets held for sale	29,034	0
Fair value of derivatives	5,922	6,883
Other assets	31,932	31,310
Total Assets	2,010,963	1,826,848
Current liabilities:
Accounts payable	93,520	82,716
Accounts payable affiliates	44	5,296
Production tax liability	23,867	25,899
Fair value of derivatives	14,623	18,439
Funds held for distribution	29,753	34,228
Current portion of long-term debt	104,050	0
Accrued interest payable	19,874	11,056
Other accrued expenses	25,720	25,715
Total current liabilities	311,451	203,349
Long-term debt	549,750	676,579
Deferred income taxes	112,800	148,427
Asset retirement obligation	35,654	61,563
Fair value of derivatives	6,573	10,137
Liabilities held for sale	22,788	0
Other liabilities	20,849	23,612
Total liabilities	1,059,865	1,123,667
Commitments and contingent liabilities
Shareholders' Equity:
Preferred shares - par value $0.01 per share, 50,000,000 shares authorized,none issued	0	0
Common shares - par value $0.01 per share, 100,000,000 authorized, 35,657,872 and 30,294,224 issued as of September 30, 2013 and December 31, 2012, respectively	357	303
Additional paid-in capital	670,990	387,494
Retained earnings	280,068	315,568
Treasury shares - at cost, 7,114 and 5,059 as of September 30, 2013 and December 31, 2012, respectively	(317)	(184)
Total shareholders' equity	951,098	703,181
Total Liabilities and Shareholders' Equity	$ 2,010,963	$ 1,826,848