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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets    
Derivative assets, gross amounts $ 122,307 $ 338,417
Derivative assets, gross amounts offset (2,741) 0
Derivative contracts 103,317 291,414
Derivative assets, noncurrent 16,249 47,003
Derivative assets, amounts net of offset 119,566 338,417
Derivative assets, financial collateral 0 0
Derivative assets, net amount 119,566 338,417
Liabilities    
Derivative liabilities, gross amounts 3,436 0
Derivative liabilities, gross amounts offset (2,741) 0
Derivative liabilities, current 369 0
Derivative liabilities, noncurrent 326 0
Derivative liabilities, amounts net of offset 695 0
Derivative liabilities, financial collateral (695) 0
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 106,058 291,414
Derivative assets, gross amounts offset (2,741) 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 103,317 291,414
Noncurrent assets    
Assets    
Derivative assets, gross amounts 16,249 47,003
Derivative assets, gross amounts offset 0 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 16,249 47,003
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 3,110 0
Derivative liabilities, gross amounts offset (2,741) 0
Derivative liabilities, financial collateral (369) 0
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts 326 0
Derivative liabilities, gross amounts offset 0 0
Derivative liabilities, financial collateral (326) 0
Derivative liabilities, net amount $ 0 $ 0