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Operating Segments and Geographic Information (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Cumulative effect adjustment $ 1,020,755 $ 933,900 $ 848,324    
Retained Earnings          
Segment Reporting Information [Line Items]          
Cumulative effect adjustment $ 873,692 $ 823,702 $ 776,403   $ 684,540
Cumulative-effect adjustment | Retained Earnings          
Segment Reporting Information [Line Items]          
Cumulative effect adjustment       $ 4,200