Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, cost	$ 661,718	$ 665,684
Accumulated depreciation	(568,315)	(555,867)
Property and equipment, net	93,403	109,817	$ 128,385
Computer hardware
Property, Plant and Equipment [Line Items]
Property and equipment, cost	157,408	159,180
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, cost	246,013	250,585
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, cost	93,144	91,112
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, cost	$ 165,153	$ 164,807