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Nature of Expenses Allocated by Function - General and Administrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]          
Personnel expenses     $ (421,552) $ (378,957) $ (436,351)
Personnel expense excluding equity awards compensation expense and research tax credit     (300,503) (278,934) (306,862)
Equity awards compensation expense     (44,528) (28,771) (40,999)
Rent and facilities costs $ (9,292) $ (13,744) (43,653) (55,033)  
Provision for doubtful accounts     (14,433) (30,818) (11,072)
General and administrative expenses     (152,634) (116,395) (139,754)
General and Administrative expenses          
Condensed Income Statements, Captions [Line Items]          
Personnel expenses     (82,652) (66,062) (75,815)
Personnel expense excluding equity awards compensation expense and research tax credit     (67,081) (57,351) (61,020)
Equity awards compensation expense     (15,571) (8,711) (14,795)
Other cash operating expenses     (66,731) (47,950) (52,057)
Subcontracting and other headcount related costs     (17,184) (9,576) (14,781)
Rent and facilities costs     (12,037) (11,228) (11,951)
Marketing costs     (2,078) (1,645) (3,130)
Consulting and professional fees     (33,436) (20,081) (19,329)
Other     (1,996) (5,420) (2,866)
Other non-cash operating expenses     (3,251) (2,383) (11,882)
Depreciation and amortization     (2,054) (4,153) (8,825)
Provision for doubtful accounts     (1,197) 1,770 (3,057)
General and administrative expenses     $ (152,634) $ (116,395) $ (139,754)