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Derivative Instruments and Hedging Activities - Offsetting Assets and Liabilities in the Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative assets    
Gross amounts of recognized assets $ 60,105 $ 2,239
Gross amounts offset in the statement of financial position (2,440) 0
Net amounts of assets presented in the statement of financial position 57,665 2,239
Gross amounts of financial instruments not offset in the statement of financial position 0 0
Net amount 57,665 2,239
Derivative liabilities    
Gross amounts of recognized liabilities 2,440 30,637
Gross amounts offset in the statement of financial position (2,440) 0
Net amounts of liabilities presented in the statement of financial position 0 30,637
Gross amounts of financial instruments not offset in the statement of financial position 0 241
Net amount $ 0 $ 30,878