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Borrowings (U.S. Corporate Office Term Loan) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 26, 2017
Dec. 13, 2016
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Contractual facility     $ 248,072 $ 300,449
U.S. Corporate Office Term Loan [Member]        
Debt Instrument [Line Items]        
Debt instrument term   10 years    
Contractual facility   $ 8,400 $ 9,124 $ 9,186
Interest rate 4.44% 4.64%    
Debt increase $ 1,500