Basis of Presentation and Summary of Significant Accounting Policies (Restated) - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Disaggregation of Revenues
Number of segments | segment									3
Revenue	$ 294,312	$ 279,229	$ 293,009	$ 300,056	$ 314,109	$ 305,280	$ 307,722	$ 365,451	$ 1,166,606	$ 1,292,562	$ 1,562,337
U.S.A.
Disaggregation of Revenues
Revenue									941,985	1,057,006	1,286,678
EMEA
Disaggregation of Revenues
Revenue									205,772	213,418	248,466
Other.
Disaggregation of Revenues
Revenue									18,849	22,138	27,193
ITPS
Disaggregation of Revenues
Revenue	216,687	208,304	217,260	231,875	243,537	234,365	243,029	284,112	874,126	1,005,043	1,234,284
ITPS | U.S.A.
Disaggregation of Revenues
Revenue									649,505	769,487	958,625
ITPS | EMEA
Disaggregation of Revenues
Revenue									205,772	213,418	248,466
ITPS | Other.
Disaggregation of Revenues
Revenue									18,849	22,138	27,193
HS
Disaggregation of Revenues
Revenue	56,547	53,995	56,204	51,093	51,623	54,209	49,166	64,049	217,839	219,047	256,721
HS | U.S.A.
Disaggregation of Revenues
Revenue									217,839	219,047	256,721
LLPS
Disaggregation of Revenues
Revenue	$ 21,078	$ 16,930	$ 19,545	$ 17,088	$ 18,949	$ 16,706	$ 15,527	$ 17,290	74,641	68,472	71,332
LLPS | U.S.A.
Disaggregation of Revenues
Revenue									$ 74,641	$ 68,472	$ 71,332