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Fair Value Measurements Net Profits Plan (Details)
 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Profits Plan liability $ 27,136,000    
Net Profits Plan liability 13,962,000    
Net Profit Plan liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Net Profits Plan liability 27,136,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) [1] (5,749,000)    
Net settlements (1) (2) [1],[2] (7,425,000)    
Transfers in (out) of Level 3 0    
Net Profits Plan liability $ 13,962,000    
Discount Rate Used to Calculate Currently in Payout Liabilities     12.00%
Number of Periods Used for Price Assumptions of Strip Prices 5    
Period Used for Price Assumptions of Strip Prices for Liabilities 1    
Percent Change in Commodity Prices for Sensitivity Analysis 5.00%    
Sensitivity Analysis Change in Liability, Due to Change in Commodity Prices $ 1,500,000    
Percent Increase and Decrease in Discount Rate for Sensitivity Analysis 1.00%    
Sensitivity Analysis Change in Liability Due to Change in Discount Rate $ (500,000)    
Net Profits Plan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash Payments Made or Accrued under Profit Sharing Plan Related to Divestiture Proceeds $ 3,800,000 $ 8,300,000  
[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 amount in the table includes cash payments made or accrued under the Net Profits Plan of $3.8 million for the nine months ended September 30, 2015, as a result of the divestitures of properties subject to the Net Profits Plan