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, 2018	$ 368,255	$ 423,856	$ 46,018	$ (79,092)	$ (22,527)
Balance (in shares) at Dec. 31, 2018		34,886
Consolidated net income	22,633			22,633
Common shares issued under stock plans (in shares)		209
Common shares withheld for taxes on vested stock awards	(6,719)		(6,719)
Common shares withheld for taxes on vested stock awards (in shares)		(84)
Repurchases of common shares	(3,339)		(3,339)
Repurchases of common shares (in shares)		(39)
Share-based compensation	5,105		5,105
Other comprehensive income, net of tax	247				247
Balance at Jun. 28, 2019	386,182	$ 423,856	41,065	(56,459)	(22,280)
Balance (in shares) at Jun. 28, 2019		34,972
Balance at Mar. 29, 2019	379,701	$ 423,856	42,855	(66,839)	(20,171)
Balance (in shares) at Mar. 29, 2019		34,998
Consolidated net income	10,380			10,380
Common shares issued under stock plans (in shares)		23
Common shares withheld for taxes on vested stock awards	(829)		(829)
Common shares withheld for taxes on vested stock awards (in shares)		(10)
Repurchases of common shares	(3,339)		(3,339)
Repurchases of common shares (in shares)		(39)
Share-based compensation	2,378		2,378
Other comprehensive income, net of tax	(2,109)				(2,109)
Balance at Jun. 28, 2019	386,182	$ 423,856	41,065	(56,459)	(22,280)
Balance (in shares) at Jun. 28, 2019		34,972
Balance at Dec. 31, 2019	417,172	$ 423,856	49,748	(38,319)	(18,113)
Balance (in shares) at Dec. 31, 2019		35,052
Consolidated net income	23,607			23,607
Common shares issued under stock plans	179		179
Common shares issued under stock plans (in shares)		256
Common shares withheld for taxes on vested stock awards	(7,936)		(7,936)
Common shares withheld for taxes on vested stock awards (in shares)		(88)
Repurchases of common shares	(5,500)		(5,500)
Repurchases of common shares (in shares)		(65)
Share-based compensation	8,847		8,847
Other comprehensive income, net of tax	(4,471)				(4,471)
Balance at Jul. 03, 2020	431,898	$ 423,856	45,338	(14,712)	(22,584)
Balance (in shares) at Jul. 03, 2020		35,155
Balance at Apr. 03, 2020	413,103	$ 423,856	39,801	(26,372)	(24,182)
Balance (in shares) at Apr. 03, 2020		35,122
Consolidated net income	11,660			11,660
Common shares issued under stock plans (in shares)		34
Common shares withheld for taxes on vested stock awards	(111)		(111)
Common shares withheld for taxes on vested stock awards (in shares)		(1)
Share-based compensation	5,648		5,648
Other comprehensive income, net of tax	1,598				1,598
Balance at Jul. 03, 2020	$ 431,898	$ 423,856	$ 45,338	$ (14,712)	$ (22,584)
Balance (in shares) at Jul. 03, 2020		35,155