Derivative Financial Instruments - Schedule of Location and Fair Value Amounts of All Derivative Instruments (Details) - Derivatives Not Designated as Hedging Contracts [Member] - Commodity Contracts [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current Derivative Assets [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Assets	$ 2,460	$ 3,694
Net Recognized Assets	2,460	$ 3,694
Noncurrent Derivative Assets [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Assets	7
Net Recognized Assets	$ 7