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Significant Accounting Policies (Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 920,755	$ 1,042,974
Less: accumulated depreciation and amortization	(733,130)	(861,933)
Total property and equipment, net	219,031	208,811
Restructuring	103,323	11,981	$ 22,247
2021 Restructuring Program
Property, Plant and Equipment [Line Items]
Restructuring	103,323	0	$ 0
Impairment of Property and Equipment \| 2021 Restructuring Program
Property, Plant and Equipment [Line Items]
Restructuring	8,500
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, gross	68,663	76,152
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	194,317	209,605
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	431,237	467,553
Equipment and furniture
Property, Plant and Equipment [Line Items]
Property and equipment, gross	65,113	88,019
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	161,425	201,645
Assets under construction
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,044	11,001
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 16,362	$ 16,769