Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 185,860	$ 154,695
Restricted cash	37,448	30,270
Accounts receivable (net of allowance of $225 and $225, respectively)	70,782	92,737
Deferred tax asset	3,390	8,191
Derivative asset	206	1,688
Other current assets	9,677	26,408
Total current assets	307,363	313,989
Oil and gas properties (using the successful efforts method of accounting):
Proved properties	4,513,526	4,291,440
Unproved properties	23,003	20,402
Total oil and gas	4,536,529	4,311,842
Less accumulated depletion, depreciation, impairment and amortization	(1,612,753)	(1,407,206)
Oil and gas properties, net	2,923,776	2,904,636
Restricted cash	10,000	10,000
Deferred financing costs, net	45,460	48,353
Other assets, net	13,093	13,124
Total assets	3,299,692	3,290,102
Liabilities and Equity
Accounts payable and accruals	236,710	230,703
Current maturities of long-term debt	27,727	21,625
Asset retirement obligation	47,897	43,386
Deferred tax liability	143
Derivative liability	25,176	37,893
Current maturities of other long-term obligations	113,364	86,521
Total current liabilities	451,017	420,128
Long-term debt	1,946,586	1,857,784
Other long-term obligations	438,207	472,500
Asset retirement obligation	114,649	123,472
Deferred tax liability	7,107	16,956
Derivative liability	17,445	6,425
Total liabilities	2,975,011	2,897,265
Commitments and contingencies (Note 13)
Temporary equity:
Redeemable noncontrolling interest	115,405	140,851
8% convertible perpetual preferred stock: $0.001 par value; 785,189 issued and outstanding at June 30, 2011; None issued at December 31, 2010; Liquidation value of $78.5 million	68,174
Shareholders' equity:
8% convertible perpetual preferred stock: $0.001 par value, 10,000,000 shares authorized; 2,339,811 issued and outstanding at June 30, 2011; 1,400,000 issued and outstanding at December 31, 2010. Liquidation value of $234.0 million and $140.0 million at June 30, 2011 and December 31, 2010, respectively.	224,583	140,000
Common stock: $0.001 par value, 100,000,000 shares authorized; 51,691,526 issued and 51,615,686 outstanding at June 30, 2011; 51,347,163 issued and 51,271,323 outstanding at December 31, 2010	52	51
Additional paid-in capital	538,778	570,739
Accumulated deficit	(527,721)	(356,866)
Accumulated other comprehensive loss	(93,679)	(101,027)
Treasury stock, at cost	(911)	(911)
Total shareholders' equity	141,102	251,986
Total liabilities and equity	$ 3,299,692	$ 3,290,102