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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |  |  |
Proved oil and gas properties | $ 6,151,765 |  | $ 5,637,462 |
Unproved oil and gas properties | 388,336 |  | 271,100 |
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $23,697 and $7,390, respectively | 23,935 |  | 19,072 |
Liabilities: |  |  |  |
Line of Credit Facility, Amount Outstanding | 0 |  | 0 |
Asset Retirement Obligations, Noncurrent | 117,916 |  | 115,659 |
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 $23,697 and $7,390, respectively | 0 | [1] | 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 $23,697 and $7,390, respectively | 0 | [1] | 0 | [1]
Fair Value, Measurements, Nonrecurring [Member] | Level 3 |  |  |  |
Assets: |  |  |  |
Proved oil and gas properties | 2,527 | [1] | 62,178 | [1]
Unproved oil and gas properties | 3,636 | [1] | 3,280 | [1]
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $23,697 and $7,390, respectively | 6,466 | [1] | 650 | [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 | 48,104 | [2] | 56,985 | [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 | 4,913 | [2] | 52,510 | [2]
Liabilities: |  |  |  |
Derivatives | 144,935 | [2] | 31,020 | [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 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 + 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 + 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 + Details
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