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Fair Value Measurements Fair Value Measurement (Details 2) (USD $) | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 Net Profit Plan liability [Member] | Jun. 30, 2014 Net Profits Plan [Member] | Jun. 30, 2013 Net Profits Plan [Member] | Jun. 30, 2014 Net Profits Plan [Member] | Jun. 30, 2014 6.625% Senior Notes Due 2019 [Member] | Dec. 31, 2013 6.625% Senior Notes Due 2019 [Member] | Jun. 30, 2014 6.50% Senior Notes Due 2021 [Member] | Dec. 31, 2013 6.50% Senior Notes Due 2021 [Member] | Jun. 30, 2014 6.50% Senior Notes Due 2023 [Member] | Dec. 31, 2013 6.50% Senior Notes Due 2023 [Member] | Jun. 30, 2014 5.0% Senior Notes Due 2024 [Member] | Dec. 31, 2013 5.0% Senior Notes Due 2024 [Member]
Liabiliity measured at fair value using Level 3 inputs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  |  |  |  | $ 370,563,000 | $ 374,290,000 | $ 380,188,000 | $ 373,625,000 | $ 432,792,000 | $ 422,000,000 | $ 502,190,000 | $ 475,315,000
Net Profits Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate Used to Calculate Currently in Payout Liabilities |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Period Used for Price Assumptions of Strip Prices of Liabilities |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Percent Change in Commodity Prices for Sensitivity Analysis |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity Analysis Change in Liability, Due to Change in Commodity Prices |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percent Change in Discount Rate for Sensitivity Analysis |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Sensitivity Analysis Decrease in Liability Due to Change in Discount Rate |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash Payments Made or Accrued under Profit Sharing Plan Related to Divested Property |  |  |  | 8,500,000 | 2,600,000 | 8,500,000 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 56,985,000 |  |  |  |  |  |  |  |  |  |  |  |
Net increase in liability |  | 5,065,000 | [1] |  |  |  |  |  |  |  |  |  |  |
Net settlements |  | (13,946,000) | [1],[2] |  |  |  |  |  |  |  |  |  |  |
Transfers in (out) of Level 3 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance |  | $ 48,104,000 |  |  |  |  |  |  |  |  |  |  |  |
Proved Oil and Gas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount Rate Used for Fair Value of Oil and Gas Properties | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Period of New York Mercantile Exchange Strip Pricing Used for Price Forecast | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Net changes in the Company’s Net Profits Plan liability are shown in the Change in Net Profits Plan liability line item of the accompanying statements of operations
[2] | Settlements represent cash payments made or accrued under the Net Profits Plan. The Company accrued or made cash payments under the Net Profits Plan of $8.5 million as a result of divestitures during the six months ended June 30, 2014

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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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