Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities
Net loss	$ (163,730)	$ (69,979)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities -
Depreciation, depletion and amortization	153,638	96,116
Impairment of oil and gas properties	45,704	12,090
Gain on exchange/disposal of properties		(12,020)
Accretion of asset retirement obligation	7,435	6,853
Deferred income tax benefit	(5,352)	(56,621)
Derivative income	(2,347)	(28,732)
Loss (gain) on debt extinguishment	(1,091)	21,829
Stock-based compensation	2,883	3,560
Amortization of deferred revenue		(18,484)
Noncash interest expense	26,085	12,439
Other noncash items, net	198	387
Changes in assets and liabilities -
Accounts receivable and other current assets	58,904	(6,125)
Accounts payable and accruals	(53,713)	15,615
Other assets and liabilities	(26,325)	5,283
Net cash provided by (used in) operating activities	42,289	(17,789)
Cash flows from investing activities
Additions to oil and gas properties	(169,180)	(377,329)
Proceeds from disposition of properties		2,053
Increase in restricted cash	(7,178)	(2,436)
Net cash used in investing activities	(176,358)	(377,712)
Cash flows from financing activities
Proceeds from senior second lien notes, net of discount		1,492,965
Proceeds from first lien term loans	59,400	147,000
Proceeds from term loan facility-ATP Titan assets	45,000
Proceeds from term loans		46,000
Payments of term loans	(12,047)	(1,262,610)
Deferred financing costs	(3,035)	(52,613)
Proceeds from other long-term obligations	70,327	171,136
Payments of other long-term obligations	(89,181)	(39,605)
Distributions to noncontrolling interest	(7,126)	(7,125)
Proceeds from preferred stock, net of costs	149,767
Purchase of capped-call options on ATP common stock	(26,500)
Preferred stock dividends	(5,544)	(5,656)
Other financings, net	(16,954)
Exercise of stock options/warrants	189	3,547
Net cash provided by financing activities	164,296	493,039
Effect of exchange rate changes on cash and cash equivalents	938	(567)
Increase in cash and cash equivalents	31,165	96,971
Cash and cash equivalents, beginning of year	154,695	108,961
Cash and cash equivalents, end of period	185,860	205,932
Noncash investing and financing activities
Increase (decrease) in noncash property additions	(3,305)	138,882
Net property additions - nonmonetary exchange		11,778
Asset retirement costs capitalized		$ 1,258