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Derivatives and Hedging Activities (Cross Currency Swap) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Currency Swap | Net Investment Hedging      
Derivative [Line Items]      
Loss recognized in AOCL $ (13,836) $ 0 $ 0