CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total		Common Shares	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2016	$ 258,870		$ 423,856	$ 30,276	$ (167,547)	$ (27,715)
Balance (in shares) at Dec. 31, 2016			34,458
Net income	60,051	[1]			60,051
Redeemable noncontrolling interest redemption value adjustment	(20,244)	[1]			(20,244)
Common shares issued under stock plans (in shares)			228
Common shares withheld for taxes on vested stock awards	(2,090)			(2,090)
Common shares withheld for taxes on vested stock awards (in shares)			(77)
Repurchases of common shares	(370)			(370)
Repurchases of common shares (in shares)			(14)
Share-based compensation	5,493			5,493
Other comprehensive income (loss), net of tax	9,835					9,835
Balance at Dec. 31, 2017	311,545		$ 423,856	33,309	(127,740)	(17,880)
Balance (in shares) at Dec. 31, 2017			34,595
Net income	49,109	[2]			49,109
Redeemable noncontrolling interest redemption value adjustment	1,781	[2]			1,781
Acquisition of noncontrolling interest	14,401			14,401
Acquisition of noncontrolling interest (in shares)			213
Common shares issued under stock plans (in shares)			231
Common shares withheld for taxes on vested stock awards	(3,556)			(3,556)
Common shares withheld for taxes on vested stock awards (in shares)			(64)
Repurchases of common shares	(5,850)			(5,850)
Repurchases of common shares (in shares)			(89)
Share-based compensation	7,714			7,714
Adoption of ASU 2016-16 | ASU 2016-16	(2,242)				(2,242)
Other comprehensive income (loss), net of tax	(4,647)					(4,647)
Balance at Dec. 31, 2018	368,255		$ 423,856	46,018	(79,092)	(22,527)
Balance (in shares) at Dec. 31, 2018			34,886
Net income	40,773	[3]			40,773
Common shares issued for business combination	10,900			10,900
Common shares issued for business combination (in shares)			124
Common shares issued under stock plans	425			425
Common shares issued under stock plans (in shares)			247
Common shares withheld for taxes on vested stock awards	(6,935)			(6,935)
Common shares withheld for taxes on vested stock awards (in shares)			(86)
Repurchases of common shares	(10,000)			(10,000)
Repurchases of common shares (in shares)			(119)
Share-based compensation	9,340			9,340
Other comprehensive income (loss), net of tax	4,414					4,414
Balance at Dec. 31, 2019	$ 417,172		$ 423,856	$ 49,748	$ (38,319)	$ (18,113)
Balance (in shares) at Dec. 31, 2019			35,052

[1] For the year ended December 31, 2017, 59 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2017.

[2] For the year ended December 31, 2018, 54 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2018.

[3] For the year ended December 31, 2019, 46 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders are considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2019.