Significant Accounting Policies - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Disaggregation of Revenues
Number of segments | segment			3
Revenue	$ 264,038	$ 279,229	$ 810,206	$ 872,294
U.S.A.
Disaggregation of Revenues
Revenue	220,633	228,132	659,865	707,476
EMEA
Disaggregation of Revenues
Revenue	39,053	46,561	136,722	150,662
Other.
Disaggregation of Revenues
Revenue	4,352	4,536	13,619	14,156
ITPS
Disaggregation of Revenues
Revenue	185,309	208,304	580,320	657,438
ITPS | U.S.A.
Disaggregation of Revenues
Revenue	141,904	157,207	429,979	492,620
ITPS | EMEA
Disaggregation of Revenues
Revenue	39,053	46,561	136,722	150,662
ITPS | Other.
Disaggregation of Revenues
Revenue	4,352	4,536	13,619	14,156
HS
Disaggregation of Revenues
Revenue	60,955	53,995	173,940	161,292
HS | U.S.A.
Disaggregation of Revenues
Revenue	60,955	53,995	173,940	161,292
LLPS
Disaggregation of Revenues
Revenue	17,774	16,930	55,946	53,564
LLPS | U.S.A.
Disaggregation of Revenues
Revenue	$ 17,774	$ 16,930	$ 55,946	$ 53,564