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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

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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