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Significant Accounting Policies (Comprehensive Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Document Period End Date Dec. 31, 2019  
Cumulative foreign currency translation $ (122,503) $ (129,406)
Cumulative supplemental benefit plans (8,917) (4,958)
Net unrecognized losses on interest rate swaps (35,296) (1,384)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 67 0
Accumulated other comprehensive loss $ (166,783) $ (135,748)