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, 2017	Dec. 31, 2016
Derivative Asset - Noncurrent [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Assets	$ 38
Gross Amounts Offset, Assets	37
Total financial assets	1
Derivative Liability - Current [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Liabilities	1,256	$ 4,595
Gross Amounts Offset, Liabilities	457
Total financial liabilities	799	4,595
Derivative Liability - Noncurrent [Member]
Derivatives Fair Value [Line Items]
Gross Recognized Liabilities	326	1,575
Total financial liabilities	$ 326	$ 1,575