Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net loss	$ (131,521)	$ (113,226)
Adjustments to reconcile net loss to net cash provided by operating activities -
Depreciation, depletion and amortization	84,906	79,320
Impairment of oil and gas properties	1,202
Accretion of asset retirement obligation	3,804	3,664
Deferred income tax expense	10,551	9,142
Derivative expense	39,197	42,856
Stock-based compensation	1,599	1,431
Noncash interest expense	11,457	17,412
Other noncash items, net	29	78
Changes in assets and liabilities -
Accounts receivable and other current assets	7,606	17,826
Accounts payable and accruals	83,780	42,490
Other assets and liabilities	(11,707)	(14,818)
Net cash provided by operating activities	100,903	86,175
Cash flows from investing activities -
Additions to oil and gas properties	(197,205)	(95,648)
Decrease (increase) in restricted cash	5,073	(3,504)
Net cash used in investing activities	(192,132)	(99,152)
Cash flows from financing activities -
Proceeds from first lien term loans	148,243	59,400
Proceeds from term loan facility-ATP Titan assets		45,000
Payments of term loans	(7,875)	(5,000)
Deferred financing costs	(50)	(2,781)
Proceeds from other long-term obligations	183,775
Payments of other long-term obligations	(59,218)	(33,926)
Distributions to noncontrolling interest	(9,253)	(3,563)
Preferred stock dividends	(6,313)	(2,758)
Derivative contracts, net	13,033
Other financings, net	(12,157)	(16,854)
Exercise of stock options/warrants	13	163
Net cash provided by financing activities	250,198	39,681
Effect of exchange rate changes on cash and cash equivalents	96	726
Increase in cash and cash equivalents	159,065	27,430
Cash and cash equivalents, beginning of year	65,678	154,695
Cash and cash equivalents, end of period	224,743	182,125
Noncash investing and financing activities
Decrease in noncash property additions	$ 90,946	$ 23,392