Annual report pursuant to Section 13 and 15(d)

Derivative Instruments Derivative Instruments - Gain (Loss) on Derivative Instruments (Details)

v3.3.1.900
Derivative Instruments Derivative Instruments - Gain (Loss) on Derivative Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net $ 83,671 $ 121,148 $ (18,189)
Gas sales      
Derivative [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net 72,412 115,324 (12,484)
Oil and condensate sales      
Derivative [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net 10,149 5,824 (5,705)
Natural gas liquids sales      
Derivative [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net $ 1,110 $ 0 $ 0