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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
ASSETS    
Derivative assets, gross amounts $ 85,524 $ 338,417
Derivative assets, gross amounts offset (1,175) 0
Derivative assets, amounts net of offset 84,349 338,417
Derivative assets, financial collateral 0 0
Derivative assets, net amount 84,349 338,417
LIABILITIES    
Derivative liabilities, gross amounts 1,748 0
Derivative liabilities, gross amounts offset (1,175) 0
Derivative liabilities, amount net of offset 573 0
Derivative liabilities, financial collateral (573) 0
Derivative liabilities, net amount 0 0
Current assets    
ASSETS    
Derivative assets, gross amounts 85,524 291,414
Derivative assets, gross amounts offset (1,175) 0
Derivative assets, amounts net of offset 84,349 291,414
Derivative assets, financial collateral 0 0
Derivative assets, net amount 84,349 291,414
Noncurrent assets    
ASSETS    
Derivative assets, gross amounts 0 47,003
Derivative assets, gross amounts offset 0 0
Derivative assets, amounts net of offset 0 47,003
Derivative assets, financial collateral 0 0
Derivative assets, net amount 0 47,003
Current liabilities    
LIABILITIES    
Derivative liabilities, gross amounts 1,748 0
Derivative liabilities, gross amounts offset (1,175) 0
Derivative liabilities, amount net of offset 573 0
Derivative liabilities, financial collateral (573) 0
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
LIABILITIES    
Derivative liabilities, gross amounts 0 0
Derivative liabilities, gross amounts offset 0 0
Derivative liabilities, amount net of offset 0 0
Derivative liabilities, financial collateral 0 0
Derivative liabilities, net amount $ 0 $ 0