Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 32,310	$ 54,372	[1]
Restricted cash	11,065	2,474	[1]
Accounts receivable, net	46,723	53,978	[1]
Accounts receivable affiliates	37,158	11,448	[1]
Fair value of derivatives	56,793	42,953	[1]
Prepaid expenses and other current assets	11,483	11,598	[1]
Total current assets	195,532	176,823	[1]
Properties and equipment, net	1,303,775	1,120,038	[1]
Assets held for sale	0	5,191	[1]
Restricted cash	21,619	2,601	[1]
Fair value of derivatives	39,220	44,464	[1]
Accounts receivable affiliates	4,284	8,478	[1]
Other assets	26,925	31,440	[1]
Total Assets	1,591,355	1,389,035	[1]
Current liabilities:
Accounts payable	63,711	47,271	[1]
Accounts payable affiliates	9,735	9,605	[1]
Production tax liability	18,685	16,226	[1]
Fair value of derivatives	21,154	29,998	[1]
Funds held for distribution	29,405	29,755	[1]
Accrued interest payable	5,798	10,051	[1]
Other accrued expenses	21,801	17,723	[1]
Total current liabilities	170,289	160,629	[1]
Long-term debt	480,238	295,695	[1]
Deferred income taxes	191,820	187,999	[1]
Asset retirement obligations	28,472	27,797	[1]
Fair value of derivatives	20,500	36,644	[1]
Accounts payable affiliates	7,093	12,111	[1]
Other liabilities	21,738	25,919	[1]
Total liabilities	920,150	746,794	[1]
Commitments and contingent liabilities			[1]
Shareholders' Equity:
Preferred shares, par value $0.01 per share; authorized 50,000,000 shares; issued: none	0	0	[1]
Common shares, par value $0.01 per share, authorized 100,000,000 shares; issued: 23,618,831 in 2011 and 23,462,326 in 2010	236	235	[1]
Additional paid-in capital	216,562	209,198	[1]
Retained earnings	454,644	432,843	[1]
Treasury shares, at cost: 7,671 in 2011 and 2,938 in 2010	(237)	(111)	[1]
Total shareholders' equity	671,205	642,165	[1]
Noncontrolling interest in subsidiary	0	76	[1]
Total equity	671,205	642,241	[1]
Total Liabilities and Equity	$ 1,591,355	$ 1,389,035	[1]

[1] Derived from audited 2010 balance sheet.