Quarterly report pursuant to Section 13 or 15(d)

Derivatives - Schedule of Recognized Gains (Losses) for Derivatives (Details)

v3.4.0.3
Derivatives - Schedule of Recognized Gains (Losses) for Derivatives (Details) - Commodity contracts [Member] - Non Designated Derivative Instruments [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Realized Gains (Losses) $ 908 $ (115)
Unrealized Losses $ (326) $ (74)