CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Accumulated Deficit) [Member]
Balance at Dec. 31, 2018	$ 361,888	$ 31	$ 369,893	$ (1,263)	$ (6,773)
Balance, Shares at Dec. 31, 2018		24,855
Issuance of shares through share-based compensation plans, net, Shares		83
Repurchase of common stock	(744)		(744)
Repurchase of common stock, Shares		(30)
Net income (loss)	7,576				7,576
Share-based compensation	2,163		2,163
Share-based compensation plan withholdings	(598)		(598)
Share-based compensation plan withholdings, Shares		(22)
Currency translation	(518)			(518)
Unrealized gain (loss) on investments	95			95
Balance at Mar. 31, 2019	369,862	$ 31	370,714	(1,686)	803
Balance, shares at Mar. 31, 2019		24,886
Balance at Dec. 31, 2018	361,888	$ 31	369,893	(1,263)	(6,773)
Balance, Shares at Dec. 31, 2018		24,855
Net income (loss)	19,662
Currency translation	(466)
Balance at Sep. 30, 2019	385,473	$ 31	374,073	(1,520)	12,889
Balance, shares at Sep. 30, 2019		25,025
Balance at Mar. 31, 2019	369,862	$ 31	370,714	(1,686)	803
Balance, Shares at Mar. 31, 2019		24,886
Issuance of shares through share-based compensation plans, net	160		160
Issuance of shares through share-based compensation plans, net, Shares		143
Net income (loss)	5,526				5,526
Share-based compensation	1,673		1,673
Share-based compensation plan withholdings	(151)		(151)
Share-based compensation plan withholdings, Shares		(5)
Currency translation	316			316
Unrealized gain (loss) on investments	114			114
Balance at Jun. 30, 2019	377,500	$ 31	372,396	(1,256)	6,329
Balance, shares at Jun. 30, 2019		25,024
Issuance of shares through share-based compensation plans, net	123		123
Issuance of shares through share-based compensation plans, net, Shares		1
Net income (loss)	6,560				6,560
Share-based compensation	1,555		1,555
Share-based compensation plan withholdings	(1)		(1)
Currency translation	(264)			(264)
Balance at Sep. 30, 2019	385,473	$ 31	374,073	(1,520)	12,889
Balance, shares at Sep. 30, 2019		25,025
Balance at Dec. 31, 2019	1,264,026	$ 50	1,269,437	(598)	(4,863)
Balance, Shares at Dec. 31, 2019		50,184
Issuance of shares through share-based compensation plans, net	164		164
Issuance of shares through share-based compensation plans, net, Shares		240
Repurchase of common stock	(33,614)	$ (1)	(33,613)
Repurchase of common stock, Shares		(1,250)
Net income (loss)	(4,404)				(4,404)
Share-based compensation	3,955		3,955
Share-based compensation plan withholdings	(1,565)		(1,565)
Share-based compensation plan withholdings, Shares		(42)
Currency translation	(2,231)			(2,231)
Unrealized gain (loss) on investments	(526)			(526)
Balance at Mar. 28, 2020	1,225,805	$ 49	1,238,378	(3,355)	(9,267)
Balance, shares at Mar. 28, 2020		49,132
Balance at Dec. 31, 2019	1,264,026	$ 50	1,269,437	(598)	(4,863)
Balance, Shares at Dec. 31, 2019		50,184
Net income (loss)	11,111
Currency translation	2,067
Balance at Sep. 26, 2020	1,237,683	$ 49	1,229,720	1,666	6,248
Balance, shares at Sep. 26, 2020		48,832
Balance at Mar. 28, 2020	1,225,805	$ 49	1,238,378	(3,355)	(9,267)
Balance, Shares at Mar. 28, 2020		49,132
Issuance of shares through share-based compensation plans, net	15		15
Issuance of shares through share-based compensation plans, net, Shares		279
Repurchase of common stock	(18,385)		(18,385)
Repurchase of common stock, Shares		(632)
Net income (loss)	7,424				7,424
Share-based compensation	4,775		4,775
Share-based compensation plan withholdings	(1,715)		(1,715)
Share-based compensation plan withholdings, Shares		(55)
Currency translation	2,495			2,495
Unrealized gain (loss) on investments	795			795
Balance at Jun. 27, 2020	1,221,209	$ 49	1,223,068	(65)	(1,843)
Balance, shares at Jun. 27, 2020		48,724
Issuance of shares through share-based compensation plans, net	2,665		2,665
Issuance of shares through share-based compensation plans, net, Shares		116
Net income (loss)	8,091				8,091
Share-based compensation	4,253		4,253
Share-based compensation plan withholdings	(266)		(266)
Share-based compensation plan withholdings, Shares		(8)
Currency translation	1,803			1,803
Unrealized gain (loss) on investments	(72)			(72)
Balance at Sep. 26, 2020	$ 1,237,683	$ 49	$ 1,229,720	$ 1,666	$ 6,248
Balance, shares at Sep. 26, 2020		48,832