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Revenue Recognition (Disaggregation of Revenue by Market Group) (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
UMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	179,436	182,925	[1]	352,903	370,544	[1]
IMG [Member]
Disaggregation of Revenue [Line Items]
Revenue	50,028	49,790	[1]	95,797	85,828	[1]
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ (24)	$ (724)		$ (69)	$ (760)
[1] Due to the market group change discussed above, we have recast our revenue by market group for the three and six months ended June 30, 2020 to present them on a consistent basis with the current year.

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