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Fair Value Measurements Net Profits Plan (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Period of New York Mercantile Exchange Strip Pricing Used for Price Forecast 5 years  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net Profits Plan Liability Noncurrent $ 7,611,000  
Net Profits Plan Liability Noncurrent $ 9,476,000 $ 7,611,000
Net Profit Plan liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 10.00% 10.00%
Period of New York Mercantile Exchange Strip Pricing Used for Price Forecast 5 years  
Period Used for Price Assumptions of Strip Prices for Liabilities 1 year  
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 $ 400,000  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net Profits Plan Liability Noncurrent 7,611,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) [1] 4,042,000  
Net settlements (1) (2) [1],[2] (2,177,000)  
Transfers in (out) of Level 3 0  
Net Profits Plan Liability Noncurrent $ 9,476,000 $ 7,611,000
[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.