Summary of Significant Accounting Policies (Details) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Property and Equipment
Proved oil and gas properties	$ 4,080,741		$ 3,835,173
Unproved oil and gas properties	81,303		78,429
Furniture, fixtures, and other equipment	38,959		37,505
Less - Accumulated depreciation, depletion, and amortization	(2,487,813)		(2,378,262)
Property and Equipment, Net	1,713,190		1,572,845
Accounts Payable and Accrued Liabilities [Abstract]
Trade accounts payable	16,038		22,459
New Zealand deferred revenue	0		10,000
Accrued expenses	16,581		19,284
Asset retirement obligation - current portion	7,986		8,708
Accrued severance taxes	4,130		10,253
Other accrued liabilities	7,477		4,890
Total accounts payable and accrued liabilities	52,212		75,594
Accumulated other comprehensive income and related tax effects for 2011
Other comprehensive income (loss) at December 31, 2010, Gross Value	(218)
Other comprehensive income (loss) at December 31, 2010, Tax Effect	81
Other comprehensive income (loss) at December 31, 2010, Net of Tax Value	(138)
Change in fair value of cash flow hedges, Gross Value	(333)
Change in fair value of cash flow hedges, Tax Effect	121
Change in fair value of cash flow hedges, Net of Tax Value	(212)
Effect of cash flow hedges settled during the period, Gross Value	883
Effect of cash flow hedges settled during the period, Tax Effect	(324)
Effect of cash flow hedges settled during the period, Net of Tax Value	559
Other comprehensive income (loss) at June 30, 2011, Gross Value	332
Other comprehensive income (loss) at June 30, 2011, Tax Effect	(122)
Other comprehensive income (loss) at June 30, 2011, Net of Tax Value	210
Roll-forward of our asset retirement obligation
Asset Retirement Obligation recorded as of January 1	78,879	64,236
Accretion of asset retirement obligation	2,299	1,929
Liabilities incurred for new wells and facilities construction	213	524
Reductions due to sold and abandoned wells	(258)	(75)
Revisions in estimated cash flows	(1,573)
Asset Retirement Obligation recorded as of June 30	$ 79,560	$ 66,614

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher AICPA
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 31, 46
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-Publisher FASB
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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.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
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-Paragraph 8

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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

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-Publisher FASB
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-Section 50
-Paragraph 1
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