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Consolidated Statement of Stockholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (loss)	Retained Earnings
Beginning Balance	$ 724,025	$ 52	$ (472,536)	$ 461,494	$ (2,941)	$ 737,956
Beginning Balance, shares		51,636	15,059
Stock options exercised, shares		314
Stock options exercised, value	8,880	$ 0		8,880
Restricted/Performance stock units vested		31
Shares paid for tax withholding, shares		(2)
Shares paid for tax withholding, value	(168)			(168)
Share-based Compensation Expense				5,332
Share-based Compensation Expense	$ 5,332
Repurchases of common stock, shares	(198)	(196)	(196)
Repurchases of common stock, value	$ (16,490)		$ (16,490)
Net income	45,630					45,630
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-16	(426)
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-16 | Adoption of ASU 2016-16						(426)
Unrealized losses from foreign currency translation adjustments	(270)
Foreign currency translation adjustment	(270)				(270)
Beginning Balance	766,513	$ 52	$ (489,026)	475,538	(3,211)	783,160
Beginning Balance, shares		51,783	15,255
Beginning Balance	$ 969,065	$ 53	$ (489,026)	533,164	(6,199)	931,073
Beginning Balance, shares		53,085	15,255
Stock options exercised, shares	224	224
Stock options exercised, value	$ 6,867	$ 0		6,867
Restricted/Performance stock units vested		29
Shares paid for tax withholding, shares		(1)
Shares paid for tax withholding, value	(123)			(123)
Share-based Compensation Expense				7,317
Share-based Compensation Expense	$ 7,317
Repurchases of common stock, shares	0
Repurchases of common stock, value	$ 0
Cumulative Effect on Retained Earnings, Tax, Adoption of ASU 2016-02 | Cumulative effect of adoption of ASU 2016-02	(26,795)					(26,795)
Net income	49,322					49,322
Unrealized losses from foreign currency translation adjustments	(577)				(577)
Foreign currency translation adjustment	(577)
Beginning Balance	$ 1,005,076	$ 53	$ (489,026)	$ 547,225	$ (6,776)	$ 953,600
Beginning Balance, shares		53,337	15,255

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