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Revenue Recognition (Disaggregation of Revenue by Geography) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 229,440 $ 231,991 $ 448,631 $ 455,612
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 192,000 189,304 377,327 383,263
United Kingdom [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 24,505 29,535 46,810 45,359
Other countries [Member]        
Disaggregation of Revenue [Line Items]        
Revenue $ 12,935 $ 13,152 $ 24,494 $ 26,990