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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |  |  |
Proved oil and gas properties | $ 5,414,842 |  | $ 5,401,684 |
Unproved oil and gas properties | 263,662 |  | 175,287 |
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $539,769 in 2013 and 20,676 in 2012 | 400,393 |  | 33,620 |
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 101,650 |  | 112,912 |
Fair Value, Measurements, Nonrecurring [Member] | Level 1 |  |  |  |
Assets: |  |  |  |
Proved oil and gas properties | 0 | [1] | 0 | [1]
Unproved oil and gas properties | 0 | [1] | 0 | [1]
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $539,769 in 2013 and 20,676 in 2012 | 0 | [1] | 0 | [1]
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 0 | [1] |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 2 |  |  |  |
Assets: |  |  |  |
Proved oil and gas properties | 0 | [1] | 0 | [1]
Unproved oil and gas properties | 0 | [1] | 0 | [1]
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $539,769 in 2013 and 20,676 in 2012 | 0 | [1] | 0 | [1]
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 0 | [1] |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 |  |  |  |
Assets: |  |  |  |
Proved oil and gas properties | 11,443 | [1] | 209,959 | [1]
Unproved oil and gas properties | 20,915 | [1] | 42,765 | [1]
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $539,769 in 2013 and 20,676 in 2012 | 15,349 | [1] | 16,527 | [1]
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 1,573 | [1] |  |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Liabilities: |  |  |  |
Net Profits Plan Liability | 0 | [2] | 0 | [2]
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |
Liabilities: |  |  |  |
Net Profits Plan Liability | 0 | [2] | 0 | [2]
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |
Liabilities: |  |  |  |
Net Profits Plan Liability | 72,404 | [2] | 78,827 | [2]
Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Assets: |  |  |  |
Derivatives | 0 | [2] | 0 | [2]
Liabilities: |  |  |  |
Derivatives | 0 | [2] | 0 | [2]
Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |
Assets: |  |  |  |
Derivatives | 71,964 | [2] | 54,339 | [2]
Liabilities: |  |  |  |
Derivatives | 29,521 | [2] | 15,644 | [2]
Derivatives not designated as hedging instruments | Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |
Assets: |  |  |  |
Derivatives | 0 | [2] | 0 | [2]
Liabilities: |  |  |  |
Derivatives | $ 0 | [2] | $ 0 | [2]
[1] | This represents a non-financial asset or liability that is measured at fair value on a nonrecurring basis.
[2] | This represents a financial asset or liability that is measured at fair value on a recurring basis.

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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Oil and Gas properties with proved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 11 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Oil and Gas properties with unproved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 11 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 147, 148 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59N -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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