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Price-Risk Management Price-Risk Management (Policies)	12 Months Ended
Price-Risk Management Price-Risk Management (Policies)	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Price-Risk Management Activities, Policy	Price-Risk Management Activities Derivatives are recorded on the balance sheet at fair value with changes in fair value recognized in earnings. The changes in the fair value of our derivatives are recognized in "Net gain (loss) on commodity derivatives" on the accompanying consolidated statements of operations. We have a price-risk management policy to use derivative instruments to protect against declines in oil, natural gas and NGL prices, mainly through the purchase of price swaps, collars and basis swaps.