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Fair Value Measurements Fair Value Measurement (Details 2) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Net Profit Plan liability [Member]
Sep. 30, 2013
Net Profits Plan [Member]
Sep. 30, 2013
6.625% Senior Notes Due 2019 [Member]
Dec. 31, 2012
6.625% Senior Notes Due 2019 [Member]
Sep. 30, 2013
6.50% Senior Notes Due 2021 [Member]
Dec. 31, 2012
6.50% Senior Notes Due 2021 [Member]
Sep. 30, 2013
6.50% Senior Notes Due 2023 [Member]
Dec. 31, 2012
6.50% Senior Notes Due 2023 [Member]
Sep. 30, 2013
5.0% Senior Notes Due 2024 [Member]
Liabiliity measured at fair value using Level 3 inputs                    
Long-term Debt, Fair Value       $ 368,375,000 $ 371,875,000 $ 374,500,000 $ 371,070,000 $ 408,000,000 $ 424,200,000 $ 461,565,000 [1]
Net Profits Plan                    
Discount Rate Used to Calculate Currently in Payout Liabilities   12.00%                
Discount Rate Used to Calculate Not Currently in Payout Liabilities   15.00%                
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   6,000,000                
Percent Change in Discount Rate for Sensitivity Analysis   1.00%                
Sensitivity Analysis Decrease in Liability Due to Change in Discount Rate   3,000,000                
Cash Payments Made or Accrued under Profit Sharing Plan Related to Divested Property     2,600,000              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]                    
Beginning balance   78,827,000                
Net increase in liability   8,736,000 [2]                
Net settlements   (15,159,000) [2],[3]                
Transfers in (out) of Level 3   0                
Ending balance   $ 72,404,000                
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] The 2024 Notes were issued on May 20, 2013.
[2] 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
[3] 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 $2.6 million relating to divestiture proceeds for the nine months ended September 30, 2013