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Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Total asset derivatives    
Gross amounts presented in the consolidated balance sheet $ 1,928 $ 10,770
Gross amounts not offset in the consolidated balance sheet subject to netting agreements (917) 0
Net amount 1,011 10,770
Total liability derivatives    
Gross amounts presented in the consolidated balance sheet (3,384) 0
Gross amounts not offset in the consolidated balance sheet subject to netting agreements 917 0
Net amount (2,467) $ 0
Cash Collateral for Borrowed Securities $ 96,800  
Share Repurchase Forward Swap    
Total liability derivatives    
Percentage of total purchase price 20.00%