Summary of Significant Accounting Policies (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Property and Equipment
Proved oil and gas properties	$ 4,259,439		$ 4,259,439		$ 3,835,173
Unproved oil and gas properties	79,439		79,439		78,429
Furniture, fixtures, and other equipment	37,344		37,344		37,505
Less - Accumulated depreciation, depletion, and amortization	(2,540,613)		(2,540,613)		(2,378,262)
Property and Equipment, Net	1,835,609		1,835,609		1,572,845
Accounts Payable and Accrued Liabilities
Trade accounts payable (1)	39,923		39,923		22,459
New Zealand deferred revenue	0		0		10,000
Accrued expenses	24,559		24,559		21,801
Asset retirement obligation - current portion	12,274		12,274		8,708
Accrued taxes	7,173		7,173		11,156
Deposit for property disposition	5,350		5,350		0
Other payables	1,472		1,472		1,470
Total accounts payable and accrued liabilities	90,751		90,751		75,594
Accumulated other comprehensive income and related tax effects for 2011
Other comprehensive loss at December 31, 2010, Gross Value			(218)
Other comprehensive loss at December 31, 2010, Tax Effect			81
Other comprehensive loss at December 31, 2010, Net of Tax Value			(138)
Change in fair value of cash flow hedges, Gross Value			(405)
Change in fair value of cash flow hedges, Tax Effect			148
Change in fair value of cash flow hedges, Net of Tax Value			(257)
Effect of cash flow hedges settled during the period, Gross Value			623
Effect of cash flow hedges settled during the period, Tax Effect			(229)
Effect of cash flow hedges settled during the period, Net of Tax Value			394
Other comprehensive income at September 30, 2011, Gross Value	0		0
Other comprehensive income at September 30, 2011, Tax Effect	0		0
Other comprehensive income at September 30, 2011, Net of Tax Value	0		0
Roll-forward of our asset retirement obligation
Asset Retirement Obligation recorded as of January 1			78,879	64,236
Accretion expense	1,183	998	3,482	2,927
Liabilities incurred for new wells and facilities construction			490	1,018
Reductions due to sold and abandoned wells			(335)	(463)
Revisions in estimated cash flows			20,995
Asset Retirement Obligation as of September 30	$ 103,511	$ 67,718	$ 103,511	$ 67,718

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Pre tax change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges, net of reclassifications into earnings during the period. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. Includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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