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	Sep. 30, 2016	Dec. 31, 2015
Current Derivative Assets [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Assets	$ 484	$ 3,694
Gross Amounts Offset, Assets	(299)
Net Recognized Assets	185	$ 3,694
Current Derivative Liabilities [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Liabilities	(1,536)
Gross Amounts Offset, Liabilities	299
Net Recognized Liabilities	(1,237)
Noncurrent Derivative Liabilities [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Liabilities	(1,101)
Net Recognized Liabilities	$ (1,101)