XML 77 R60.htm IDEA: XBRL DOCUMENT v3.6.0.2
Derivatives Commodity Derivatives Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Effect of Derivative Instruments on the Consolidated Balance Sheet [Line Items]    
Asset derivatives, fair value $ 0 $ 0
Fair value of derivative liabilities, current 12,895 0
Fair value of commodity derivatives 0  
Liability derivatives, fair value 12,895 0
Assets    
Fair value of commodity derivatives — gross presentation 0 0
Effects of netting arrangements 0 0
Asset derivatives, fair value 0 0
Liabilities    
Fair value of commodity derivatives — gross presentation 12,895 0
Effects of netting arrangements 0 0
Liability derivatives, fair value 12,895 0
Not Designated as Hedging Instrument | Commodity Contract    
Effect of Derivative Instruments on the Consolidated Balance Sheet [Line Items]    
Fair value of derivative assets, current 0 0
Fair value of derivative assets, noncurrent 0 0
Asset derivatives, fair value 0 0
Fair value of derivative liabilities, current 12,895 0
Fair value of commodity derivatives 0 0
Liability derivatives, fair value 12,895 0
Assets    
Asset derivatives, fair value 0 0
Liabilities    
Liability derivatives, fair value $ 12,895 $ 0