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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ 16,441	$ (6,847)
Adjustments to reconcile net loss to net cash provided by operating activities:
Equity in earnings of subsidiaries
Depreciation, depletion and amortization	38,886	13,812
Impairment of oil and gas properties	368	1,381
Deferred income taxes	9,822	(4,161)
Derivative instruments	18,586	31,666
Stock-based compensation expenses	1,591	527
Debt discount amortization and other	648	256
Working capital and other changes:
Change in accounts receivable	(26,038)	(6,667)
Change in inventory	(9,641)	(37)
Change in prepaid expenses	31	479
Change in other current assets	483	(113)
Change in other assets		(3)
Change in accounts payable and accrued liabilities	10,775	(7,448)
Change in other current liabilities	(188)
Change in other liabilities	1,001
Net cash provided by (used in) operating activities	62,765	22,845
Cash flows from investing activities:
Capital expenditures	(269,975)	(91,126)
Derivative settlements	(1,291)	(512)
Purchases of short-term investments	0	(114,974)
Redemptions of short-term investments	19,994
Advances to joint interest partners	655	885
Advances from joint interest partners	5,484	4,938
Net cash used in investing activities	(245,133)	(200,789)
Cash flows from financing activities:
Proceeds from issuance of senior notes		400,000
Purchases of treasury stock	(1,181)	(559)
Debt issuance costs	(25)	(10,027)
Investment in / capital contributions from subsidiaries
Net cash provided by (used in) financing activities	(1,206)	389,414
Increase (decrease) in cash and cash equivalents	(183,574)	211,470
Beginning of period	470,872	143,520
End of period	287,298	354,990
Parent/Issuer [Member]
Cash flows from operating activities:
Net loss	16,441	(6,847)
Adjustments to reconcile net loss to net cash provided by operating activities:
Equity in earnings of subsidiaries	(26,264)	3,170
Depreciation, depletion and amortization
Impairment of oil and gas properties
Deferred income taxes	(5,863)	(2,234)
Derivative instruments
Stock-based compensation expenses	1,591	527
Debt discount amortization and other	480	188
Working capital and other changes:
Change in accounts receivable
Change in inventory
Change in prepaid expenses	155	118
Change in other current assets	10	(113)
Change in accounts payable and accrued liabilities	904	5,681
Change in other current liabilities
Change in other liabilities
Net cash provided by (used in) operating activities	(12,546)	490
Cash flows from investing activities:
Capital expenditures
Derivative settlements
Purchases of short-term investments		(114,974)
Redemptions of short-term investments	19,994
Advances to joint interest partners
Advances from joint interest partners
Net cash used in investing activities	19,994	(114,974)
Cash flows from financing activities:
Proceeds from issuance of senior notes		400,000
Purchases of treasury stock	(1,181)	(559)
Debt issuance costs		(9,650)
Investment in / capital contributions from subsidiaries	(156,315)	(49,999)
Net cash provided by (used in) financing activities	(157,496)	339,792
Increase (decrease) in cash and cash equivalents	(150,048)	225,308
Beginning of period	443,482	119,940
End of period	293,434	345,248
Combined Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net loss	26,264	(3,170)
Adjustments to reconcile net loss to net cash provided by operating activities:
Equity in earnings of subsidiaries
Depreciation, depletion and amortization	38,886	13,812
Impairment of oil and gas properties	368	1,381
Deferred income taxes	15,685	(1,927)
Derivative instruments	18,586	31,666
Stock-based compensation expenses
Debt discount amortization and other	168	68
Working capital and other changes:
Change in accounts receivable	(27,768)	(7,550)
Change in inventory	(9,641)	(37)
Change in prepaid expenses	(124)	361
Change in other current assets	473
Change in other assets		(3)
Change in accounts payable and accrued liabilities	11,601	(12,246)
Change in other current liabilities	(188)
Change in other liabilities	1,001
Net cash provided by (used in) operating activities	75,311	22,355
Cash flows from investing activities:
Capital expenditures	(269,975)	(91,126)
Derivative settlements	(1,291)	(512)
Redemptions of short-term investments
Advances to joint interest partners	655	885
Advances from joint interest partners	5,484	4,938
Net cash used in investing activities	(265,127)	(85,815)
Cash flows from financing activities:
Purchases of treasury stock
Debt issuance costs	(25)	(377)
Investment in / capital contributions from subsidiaries	156,315	49,999
Net cash provided by (used in) financing activities	156,290	49,622
Increase (decrease) in cash and cash equivalents	(33,526)	(13,838)
Beginning of period	27,390	23,580
End of period	(6,136)	9,742
Intercompany Eliminations [Member]
Cash flows from operating activities:
Net loss	(26,264)	3,170
Adjustments to reconcile net loss to net cash provided by operating activities:
Equity in earnings of subsidiaries	26,264	(3,170)
Depreciation, depletion and amortization
Impairment of oil and gas properties
Deferred income taxes
Derivative instruments
Stock-based compensation expenses
Debt discount amortization and other
Working capital and other changes:
Change in accounts receivable	1,730	883
Change in inventory
Change in prepaid expenses
Change in other current assets
Change in accounts payable and accrued liabilities	(1,730)	(883)
Change in other current liabilities
Change in other liabilities
Net cash provided by (used in) operating activities
Cash flows from investing activities:
Capital expenditures
Derivative settlements
Redemptions of short-term investments
Advances to joint interest partners
Advances from joint interest partners
Net cash used in investing activities
Cash flows from financing activities:
Purchases of treasury stock
Debt issuance costs
Investment in / capital contributions from subsidiaries
Net cash provided by (used in) financing activities
Increase (decrease) in cash and cash equivalents
Beginning of period
End of period

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The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).

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