Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member] Class A Common Stock [Member]	Common Stock [Member] Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2021	$ 613,197		$ 5	$ 3	$ 724,226		$ (102,087)		$ (8,950)
Beginning balance (in shares) at Dec. 31, 2021			51,524,000	27,745,000
Net Income (Loss)	11,528						11,528
Issuance of common stock for employee stock purchase program	4,187				4,187
Issuance of common stock for employee stock purchase program (in shares)			77,000
Exercise of stock options	238				238
Exercise of stock options (in shares)			86,000
Vesting of restricted stock (in shares)			324,000
Stock-based compensation	19,403				19,403
Foreign currency translation, net of tax	(4,163)								(4,163)
Retirement related benefit plans, net of tax	105								105
Ending balance at Mar. 31, 2022	618,425	$ (26,070)	$ 5	$ 3	698,045	$ (50,009)	(66,620)	$ 23,939	(13,008)
Ending balance (in shares) at Mar. 31, 2022			52,011,000	27,745,000
Beginning balance at Dec. 31, 2021	613,197		$ 5	$ 3	724,226		(102,087)		(8,950)
Beginning balance (in shares) at Dec. 31, 2021			51,524,000	27,745,000
Net Income (Loss)	(55,494)
Foreign currency translation, net of tax	(37,929)
Retirement related benefit plans, net of tax	306
Ending balance at Sep. 30, 2022	535,529		$ 5	$ 3	715,736		(133,642)		(46,573)
Ending balance (in shares) at Sep. 30, 2022			52,377	27,745
Beginning balance at Mar. 31, 2022	618,425	$ (26,070)	$ 5	$ 3	698,045	$ (50,009)	(66,620)	$ 23,939	(13,008)
Beginning balance (in shares) at Mar. 31, 2022			52,011,000	27,745,000
Net Income (Loss)	(33,774)						(33,774)
Settlement of convertible senior notes	(29,756)				(29,756)
Repurchase and retirement of common stock	(4,387)				(4,387)
Repurchase and retirement of common stock, Shares			(85,000)
Reclassification of mezzanine equity to permanent equity	784				784
Exercise of stock options	1,452				1,452
Exercise of stock options (in shares)			222,000
Vesting of restricted stock (in shares)			43,000
Stock-based compensation	21,200				21,200
Foreign currency translation, net of tax	(15,949)								(15,949)
Retirement related benefit plans, net of tax	177								177
Ending balance at Jun. 30, 2022	558,172		$ 5	$ 3	687,338		(100,394)		(28,780)
Ending balance (in shares) at Jun. 30, 2022			52,191,000	27,745,000
Net Income (Loss)	(33,248)						(33,248)
Issuance of common stock for employee stock purchase program	4,536				4,536
Issuance of common stock for employee stock purchase program (in shares)			108
Exercise of stock options	1,152				1,152
Exercise of stock options (in shares)			56
Vesting of restricted stock (in shares)			22
Stock-based compensation	22,710				22,710
Foreign currency translation, net of tax	(17,817)								(17,817)
Retirement related benefit plans, net of tax	24								24
Ending balance at Sep. 30, 2022	535,529		$ 5	$ 3	715,736		(133,642)		(46,573)
Ending balance (in shares) at Sep. 30, 2022			52,377	27,745
Beginning balance at Dec. 31, 2022	569,736		$ 5	$ 3	721,307		(121,577)		(30,002)
Beginning balance (in shares) at Dec. 31, 2022			52,277,000	27,745,000
Net Income (Loss)	(1,959)						(1,959)
Issuance of common stock for acquisitions (in shares)			34,000
Repurchase and retirement of common stock	(4,256)				(4,256)
Repurchase and retirement of common stock, Shares			(91,000)
Issuance of common stock for employee stock purchase program	3,648				3,648
Issuance of common stock for employee stock purchase program (in shares)			92,000
Exercise of stock options	10,324				10,324
Exercise of stock options (in shares)			265,000
Vesting of restricted stock (in shares)			336,000
Conversion from Class B to Class A common stock			240,000	(240,000)
Stock-based compensation	22,161				22,161
Foreign currency translation, net of tax	7,232								7,232
Retirement related benefit plans, net of tax	19								19
Ending balance at Mar. 31, 2023	606,905		$ 5	$ 3	753,184		(123,536)		(22,751)
Ending balance (in shares) at Mar. 31, 2023			53,153,000	27,505,000
Beginning balance at Dec. 31, 2022	569,736		$ 5	$ 3	721,307		(121,577)		(30,002)
Beginning balance (in shares) at Dec. 31, 2022			52,277,000	27,745,000
Net Income (Loss)	(28,601)
Foreign currency translation, net of tax	(2,215)
Retirement related benefit plans, net of tax	(46)
Ending balance at Sep. 30, 2023	634,118		$ 5	$ 3	816,551		(150,178)		(32,263)
Ending balance (in shares) at Sep. 30, 2023			54,351,000	27,045
Beginning balance at Mar. 31, 2023	606,905		$ 5	$ 3	753,184		(123,536)		(22,751)
Beginning balance (in shares) at Mar. 31, 2023			53,153,000	27,505,000
Net Income (Loss)	(22,280)						(22,280)
Exercise of stock options	13,264				13,264
Exercise of stock options (in shares)			382,000
Vesting of restricted stock (in shares)			86,000
Conversion from Class B to Class A common stock			330,000	(330,000)
Stock-based compensation	23,736				23,736
Foreign currency translation, net of tax	(1,340)								(1,340)
Retirement related benefit plans, net of tax	(70)								(70)
Ending balance at Jun. 30, 2023	620,215		$ 5	$ 3	790,184		(145,816)		(24,161)
Ending balance (in shares) at Jun. 30, 2023			53,951,000	27,175,000
Net Income (Loss)	(4,362)						(4,362)
Issuance of common stock for acquisitions (in shares)			53,000
Issuance of common stock for employee stock purchase program	3,903				3,903
Issuance of common stock for employee stock purchase program (in shares)			91,000
Exercise of stock options	1,938				1,938
Exercise of stock options (in shares)			79,000
Vesting of restricted stock (in shares)			47,000
Conversion from Class B to Class A common stock			130,000	(130,000)
Stock-based compensation	20,526				20,526
Foreign currency translation, net of tax	(8,107)								(8,107)
Retirement related benefit plans, net of tax	5								5
Ending balance at Sep. 30, 2023	$ 634,118		$ 5	$ 3	$ 816,551		$ (150,178)		$ (32,263)
Ending balance (in shares) at Sep. 30, 2023			54,351,000	27,045