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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |  |  |
Derivatives | $ 63,805 |  | $ 52,510 |
Proved oil and gas properties | 6,789,927 |  | 5,637,462 |
Unproved oil and gas properties | 536,100 |  | 271,100 |
Disposal Group, Including Discontinued Operation, Long Lived Assets, Current | 19,900 |  |  |
Liabilities: |  |  |  |
Derivatives | (12,892) |  | (31,020) |
Line of Credit Facility, Amount Outstanding | 390,000 |  | 0 |
Asset Retirement Obligations, Noncurrent | 123,905 |  | 115,659 |
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 452 |  | 3,033 |
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]
Disposal Group, Including Discontinued Operation, Long Lived Assets, Current | 0 | [1] | 0 | [1]
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 0 |  |  |
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 0 |  |  |
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]
Disposal Group, Including Discontinued Operation, Long Lived Assets, Current | 0 | [1] | 0 | [1]
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 0 |  |  |
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 0 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Level 3 |  |  |  |
Assets: |  |  |  |
Proved oil and gas properties | 9,443 | [1] | 62,178 | [1]
Unproved oil and gas properties | 43,252 | [1] | 3,280 | [1]
Disposal Group, Including Discontinued Operation, Long Lived Assets, Current | 17,952 | [1] | 650 | [1]
Liabilities: |  |  |  |
Asset Retirement Obligations, Noncurrent | 923 |  |  |
Asset Retirement Obligation, Legally Restricted Assets, Fair Value | 452 |  |  |
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 | 41,705 | [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 | 63,805 | [2] | 52,510 | [2]
Liabilities: |  |  |  |
Derivatives | 12,892 | [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.

X
- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation for an asset held for sale. 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 No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Amount classified as long lived assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + 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 Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2473-110228 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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