Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Fair value (Details)

v3.7.0.1
Derivative Instruments - Fair value (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Fair value of derivative instruments    
Current portion of fair value of derivative assets $ 237,086 $ 73,022
Noncurrent portion of fair value of derivative assets 1,811,435 1,731,063
Total asset derivatives 2,048,521 1,804,085
Current portion of fair value of derivative liabilities 54,277 203,635
Noncurrent portion of fair value of derivative liabilities 102 234
Total liability derivatives 54,379 203,869
Derivatives not designated as hedges for accounting purposes | Net fair value of commodity derivative assets position    
Fair value of derivative instruments    
Current portion of fair value of derivative assets 237,086 73,022
Noncurrent portion of fair value of derivative assets 1,811,435 1,731,063
Total asset derivatives 2,048,521 1,804,085
Current portion of fair value of derivative liabilities 54,277 203,635
Noncurrent portion of fair value of derivative liabilities 102 234
Total liability derivatives 54,379 203,869
Net derivatives $ 1,994,142 $ 1,600,216
Derivatives designated as hedges for accounting purposes    
Fair value of derivative instruments    
Number of derivative instruments held designated as hedges | item 0