Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 44,910	$ 39,076	$ 101,916	$ 68,745
Other comprehensive (loss) income, net of taxes:
Foreign currency translation adjustments	(19,513)	582	(28,695)	(4,503)
Actuarial gain on retirement plan, net of tax effect of $(9), $(8), $(17), and $(15), respectively	21	17	42	26
Total other comprehensive (loss) income, net of taxes	(19,492)	599	(28,653)	(4,477)
Comprehensive income	$ 25,418	$ 39,675	$ 73,263	$ 64,268