Hedging Program and Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Impact of derivative contracts on balance sheet [Abstract]
Derivative asset - current	$ 0	$ 54
Derivative Assets	0	54
Derivative liability - current	10,837	2,382
Derivative liability - long-term	2,387	6,630
Derivative Liabilities	13,224	9,012
Derivative Asset - Current [Member] \| Commodity Price Derivatives [Member]
Impact of derivative contracts on balance sheet [Abstract]
Derivative asset - current	0	54
Derivative Asset - Long-Term [Member] \| Commodity Price Derivatives [Member]
Impact of derivative contracts on balance sheet [Abstract]
Derivative asset - long-term	0	0
Derivative Liability - Current [Member] \| Commodity Price Derivatives [Member]
Impact of derivative contracts on balance sheet [Abstract]
Derivative liability - current	10,837	2,382
Derivative Liability - Long-Term [Member] \| Commodity Price Derivatives [Member]
Impact of derivative contracts on balance sheet [Abstract]
Derivative liability - long-term	$ 2,387	$ 6,630

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