Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock Shares [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Common stock, shares outstanding at Dec. 31, 2019		20,742,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2019	$ 1,377,244		$ 2,074	$ 668,947	$ (157)	$ 721,782	$ (15,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		155,000
Stock Issued During Period, Value, New Issues	$ 560		9		10,758
Adjustments to Additional Paid in Capital, Other				(10,207)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	(63,511)	(64,000)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ (12,174)				(12,174)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	6,939			6,939
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(13,510)
Net Income Attributable to Parent	16,834					16,834
Stockholders' Equity Attributable to Parent at Mar. 31, 2020	1,375,893		2,083	665,679	(1,573)	738,616	(28,912)
Common stock, shares outstanding at Mar. 31, 2020		20,833,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive income (loss), net of Tax	$ (13,510)						(13,510)
Common stock, shares outstanding at Dec. 31, 2020	21,058,000	21,058,000
Stockholders' Equity Attributable to Parent at Dec. 31, 2020	$ 1,502,265		2,106	693,068	(39)	808,652	(1,522)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, New Issues		198,000
Stock Issued During Period, Value, New Issues	$ 4,864		16		2,352
Adjustments to Additional Paid in Capital, Other				2,496
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	(37,423)	(37,000)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ (7,723)				(7,723)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	6,022			6,022
Other Comprehensive (Loss) Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(8,391)
Net Income Attributable to Parent	23,731					23,731
Stockholders' Equity Attributable to Parent at Mar. 31, 2021	$ 1,520,768		$ 2,122	$ 701,586	$ (5,410)	$ 832,383	(9,913)
Common stock, shares outstanding at Mar. 31, 2021	21,192,000	21,219,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive income (loss), net of Tax	$ (8,391)						$ (8,391)