Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 172,175	$ 154,695
Restricted cash	12,660	30,270
Accounts receivable (net of allowance of $225 and $225, respectively)	95,905	92,737
Deferred tax asset		8,191
Derivative asset	1,880	1,688
Other current assets	35,252	26,408
Total current assets	317,872	313,989
Oil and gas properties (using the successful efforts method of accounting):
Proved properties	4,687,122	4,291,440
Unproved properties	23,530	20,402
Total oil and gas	4,710,652	4,311,842
Less accumulated depletion, depreciation, impairment and amortization	(1,685,647)	(1,407,206)
Oil and gas properties, net	3,025,005	2,904,636
Derivative asset	4,176
Deferred tax asset	16,899
Restricted cash	10,000	10,000
Deferred financing costs, net	43,934	48,353
Other assets, net	13,270	13,124
Total assets	3,431,156	3,290,102
Liabilities and Equity
Accounts payable and accruals	286,086	230,703
Current maturities of long-term debt	31,989	21,625
Asset retirement obligation	61,255	43,386
Deferred tax liability	17,038
Derivative liability	28,653	37,893
Current maturities of other long-term obligations	153,004	86,521
Total current liabilities	578,025	420,128
Long-term debt	1,983,704	1,857,784
Other long-term obligations	414,015	472,500
Asset retirement obligation	95,488	123,472
Deferred tax liability	47,768	16,956
Derivative liability	642	6,425
Total liabilities	3,119,642	2,897,265
Commitments and contingencies (Note 13)
Temporary equity:
Redeemable noncontrolling interest	115,406	140,851
8% convertible perpetual preferred stock: $0.001 par value; 784,943 issued and outstanding at September 30, 2011; None issued at December 31, 2010; Liquidation value of $78.5 million	68,153
Shareholders' equity:
8% convertible perpetual preferred stock: $0.001 par value, 10,000,000 shares authorized; 2,340,057 issued and outstanding at September 30, 2011; 1,400,000 issued and outstanding at December 31, 2010. Liquidation value of $234.0 million and $140.0 million at September 30, 2011 and December 31, 2010, respectively.	224,583	140,000
Common stock: $0.001 par value, 100,000,000 shares authorized; 51,695,201 issued and 51,619,361 outstanding at September 30, 2011; 51,347,163 issued and 51,271,323 outstanding at December 31, 2010	52	51
Additional paid-in capital	533,885	570,739
Accumulated deficit	(526,586)	(356,866)
Accumulated other comprehensive loss	(103,068)	(101,027)
Treasury stock, at cost	(911)	(911)
Total shareholders' equity	127,955	251,986
Total liabilities and equity	$ 3,431,156	$ 3,290,102