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Derivatives - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Derivative assets, gross amounts $ 3,040 $ 5,582
Derivative assets, gross amounts offset (3,040) (4,272)
Derivative assets, amounts net of offset 0 1,310
Financial collateral (obligation to return cash) 0 0
Derivative assets, net amount 0 1,310
Liabilities    
Derivative liabilities, gross amounts 28,135 18,467
Derivative liabilities, gross amounts offset (3,040) (4,272)
Derivative liabilities, amounts net of offset 25,095 14,195
Financial collateral (right to reclaim cash) (25,095) (14,195)
Derivative liabilities, net amount 0 0
Current assets    
Assets    
Derivative assets, gross amounts 3,040 5,582
Derivative assets, gross amounts offset (3,040) (4,272)
Derivative assets, amounts net of offset 0 1,310
Financial collateral (obligation to return cash) 0 0
Derivative assets, net amount 0 1,310
Noncurrent assets    
Assets    
Derivative assets, gross amounts 0 0
Derivative assets, gross amounts offset 0 0
Derivative assets, amounts net of offset 0 0
Financial collateral (obligation to return cash) 0 0
Derivative assets, net amount 0 0
Current liabilities    
Liabilities    
Derivative liabilities, gross amounts 22,992 14,899
Derivative liabilities, gross amounts offset (3,040) (4,272)
Derivative liabilities, amounts net of offset 19,952 10,627
Financial collateral (right to reclaim cash) (19,952) (10,627)
Derivative liabilities, net amount 0 0
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross amounts 5,143 3,568
Derivative liabilities, gross amounts offset 0 0
Derivative liabilities, amounts net of offset 5,143 3,568
Financial collateral (right to reclaim cash) (5,143) (3,568)
Derivative liabilities, net amount $ 0 $ 0