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Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Total asset derivatives    
Gross amounts presented in the consolidated balance sheet $ 16,225 $ 10,166
Gross amounts not offset in the consolidated balance sheet subject to netting agreements 0 0
Net amount $ 16,225 $ 10,166
Cash collateral for borrowed securities, percent 20.00%  
Cash collateral for borrowed securities $ 69,400