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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Assets    
Derivative assets, gross amounts $ 146,124 $ 338,417
Derivative assets, gross amounts offset (2,079) 0
Derivative assets, current 120,575 291,414
Derivative assets, noncurrent 23,470 47,003
Derivative assets, amounts net of offset 144,045 338,417
Derivative assets, financial collateral 0 0
Derivative assets, net amount 144,045 338,417
Liabilities    
Derivative liabilities, gross amounts 2,207 0
Derivative liabilities, gross amounts offset (2,079) 0
Derivative liabilities, current 102 0
Derivative liabilities, noncurrent 26 0
Derivative liabilities, amounts net of offset 128 0
Derivative liabilities, financial collateral (128) 0
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 122,672 291,414
Derivative assets, gross amounts offset (2,097) 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 120,575 291,414
Noncurrent assets    
Assets    
Derivative assets, gross amounts 23,452 47,003
Derivative assets, gross amounts offset 18 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 23,470 47,003
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 2,199 0
Derivative liabilities, gross amounts offset (2,097) 0
Derivative liabilities, financial collateral (102) 0
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts 8 0
Derivative liabilities, gross amounts offset 18 0
Derivative liabilities, financial collateral (26) 0
Derivative liabilities, net amount $ 0 $ 0