Significant Accounting Policies - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)
Disaggregation of Revenues
Number of segments | segment			3
Revenue	$ 266,770	$ 293,009	$ 546,168	$ 593,065
U.S.A.
Disaggregation of Revenues
Revenue	216,497	238,240	439,232	479,344
EMEA
Disaggregation of Revenues
Revenue	45,691	49,892	97,669	104,101
Other.
Disaggregation of Revenues
Revenue	4,582	4,877	9,267	9,620
ITPS
Disaggregation of Revenues
Revenue	190,005	217,260	395,012	449,135
ITPS | U.S.A.
Disaggregation of Revenues
Revenue	139,732	162,491	288,076	335,414
ITPS | EMEA
Disaggregation of Revenues
Revenue	45,691	49,892	97,669	104,101
ITPS | Other.
Disaggregation of Revenues
Revenue	4,582	4,877	9,267	9,620
HS
Disaggregation of Revenues
Revenue	56,390	56,204	112,986	107,297
HS | U.S.A.
Disaggregation of Revenues
Revenue	56,390	56,204	112,986	107,297
LLPS
Disaggregation of Revenues
Revenue	20,375	19,545	38,170	36,633
LLPS | U.S.A.
Disaggregation of Revenues
Revenue	$ 20,375	$ 19,545	$ 38,170	$ 36,633