Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments Textuals (Details)

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Derivative Financial Instruments Textuals (Details)
bbl in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
bbl
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
bbl
Jun. 30, 2016
USD ($)
Derivative        
Compliance Program Costs | $ $ 2,280 $ 2,089 $ 6,438 $ 2,908
Forward Contracts | Fair Value Hedge        
Derivative        
Notional Amount of Fair Value Hedge Instruments | bbl 116   116