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Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Total asset derivatives    
Gross amounts presented in the consolidated balance sheet $ 606 $ 10,770
Gross amounts not offset in the consolidated balance sheet subject to netting agreements (325) 0
Net amount 281 10,770
Total liability derivatives    
Gross amounts presented in the consolidated balance sheet (6,550) 0
Gross amounts not offset in the consolidated balance sheet subject to netting agreements 325 0
Net amount (6,225) $ 0
Cash Collateral for Borrowed Securities $ 108,900  
Share Repurchase Forward Swap    
Total liability derivatives    
Percentage of total purchase price 20.00%