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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Assets    
Derivative assets, gross amounts $ 21,000 $ 85,524
Derivative assets, gross amounts offset 0 (1,175)
Derivative assets, amounts net of offset 21,000 84,349
Derivative assets, financial collateral 0 0
Derivative assets, net amount 21,000 84,349
Liabilities    
Derivative liabilities, gross amounts 356 1,748
Derivative liabilities, gross amounts offset 0 (1,175)
Derivative liabilities, amounts net of offset 356 573
Derivative liabilities, financial collateral (356) (573)
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 21,000 85,524
Derivative assets, gross amounts offset 0 (1,175)
Derivative assets, amounts net of offset 21,000 84,349
Derivative assets, financial collateral 0 0
Derivative assets, net amount 21,000 84,349
Noncurrent assets    
Assets    
Derivative assets, gross amounts 0 0
Derivative assets, gross amounts offset 0 0
Derivative assets, amounts net of offset 0 0
Derivative assets, financial collateral 0 0
Derivative assets, net amount 0 0
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 356 1,748
Derivative liabilities, gross amounts offset 0 (1,175)
Derivative liabilities, amounts net of offset 356 573
Derivative liabilities, financial collateral (356) (573)
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts 0 0
Derivative liabilities, gross amounts offset 0 0
Derivative liabilities, amounts net of offset 0 0
Derivative liabilities, financial collateral 0 0
Derivative liabilities, net amount $ 0 $ 0