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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]
Balance at Dec. 29, 2018		$ 869,433	$ 456	$ 0	$ (40,839)	$ 909,816
Balance (in shares) at Dec. 29, 2018			45,629,014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		4,780	$ 1	4,779	0	0
Exercise of stock options (in shares)			72,192
Withholdings from vesting of restricted stock		(4,077)	$ 0	(4,077)	0	0
Withholdings from vesting of restricted stock (in shares)			(43,844)
Restricted stock activity		0	$ 2	(2)	0	0
Restricted stock activity (in shares)			182,722
Stock-based compensation expense		4,613	$ 0	4,613	0	0
Repurchase of common stock		(39,966)	$ (5)	(5,313)	0	(34,648)
Repurchase of common stock (in shares)			(460,257)
Cash dividends declared and paid		(22,756)	$ 0	0	0	(22,756)
Comprehensive income		37,377	0	0	2,911	34,466
Reclassification of tax effects	[1]	0	0	0	(1,500)	1,500
Balance at Mar. 30, 2019		849,404	$ 454	0	(39,428)	888,378
Balance (in shares) at Mar. 30, 2019			45,379,827
Balance at Dec. 29, 2018		869,433	$ 456	0	(40,839)	909,816
Balance (in shares) at Dec. 29, 2018			45,629,014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		142,086
Balance at Sep. 28, 2019		$ 812,734	$ 443	0	(38,908)	851,199
Balance (in shares) at Sep. 28, 2019		44,287,636	44,287,636
Balance at Mar. 30, 2019		$ 849,404	$ 454	0	(39,428)	888,378
Balance (in shares) at Mar. 30, 2019			45,379,827
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		1,566	$ 0	1,566	0	0
Exercise of stock options (in shares)			26,264
Withholdings from vesting of restricted stock		(49)	$ 0	(49)	0	0
Withholdings from vesting of restricted stock (in shares)			(505)
Restricted stock activity		0	$ 0	0	0	0
Restricted stock activity (in shares)			8,597
Stock-based compensation expense		5,194	$ 0	5,194	0	0
Repurchase of common stock		(52,477)	$ (5)	(6,711)	0	(45,761)
Repurchase of common stock (in shares)			(545,620)
Cash dividends declared and paid		(22,545)	$ 0	0	0	(22,545)
Comprehensive income		46,804	0	0	2,867	43,937
Balance at Jun. 29, 2019		827,897	$ 449	0	(36,561)	864,009
Balance (in shares) at Jun. 29, 2019			44,868,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		535	$ 0	535	0	0
Exercise of stock options (in shares)			8,490
Withholdings from vesting of restricted stock		(88)	$ 0	(88)	0	0
Withholdings from vesting of restricted stock (in shares)			(1,013)
Restricted stock activity		0	$ 0	0	0	0
Restricted stock activity (in shares)			13,639
Stock-based compensation expense		3,733	$ 0	3,733	0	0
Repurchase of common stock		(55,021)	$ (6)	(4,180)	0	(50,835)
Repurchase of common stock (in shares)			(602,043)
Cash dividends declared and paid		(22,227)	$ 0	0	0	(22,227)
Comprehensive income		57,905	0	0	(2,347)	60,252
Balance at Sep. 28, 2019		$ 812,734	$ 443	0	(38,908)	851,199
Balance (in shares) at Sep. 28, 2019		44,287,636	44,287,636
Balance at Dec. 28, 2019		$ 880,130	$ 440	0	(35,634)	915,324
Balance (in shares) at Dec. 28, 2019		43,963,103	43,963,103
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		$ 1,840	$ 0	1,840	0	0
Exercise of stock options (in shares)			33,158
Withholdings from vesting of restricted stock		(4,712)	$ 0	(4,712)	0	0
Withholdings from vesting of restricted stock (in shares)			(43,611)
Restricted stock activity		0	$ 1	(1)	0	0
Restricted stock activity (in shares)			132,759
Stock-based compensation expense		1,945	$ 0	1,945	0	0
Repurchase of common stock		(45,255)	$ (5)	928	0	(46,178)
Repurchase of common stock (in shares)			(474,684)
Cash dividends declared and paid		(26,260)	$ 0	0	0	(26,260)
Comprehensive income		(91,686)	0	0	(12,992)	(78,694)
Balance at Mar. 28, 2020		716,002	$ 436	0	(48,626)	764,192
Balance (in shares) at Mar. 28, 2020			43,610,725
Balance at Dec. 28, 2019		$ 880,130	$ 440	0	(35,634)	915,324
Balance (in shares) at Dec. 28, 2019		43,963,103	43,963,103
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		$ 4,935
Balance at Sep. 26, 2020		$ 821,881	$ 436	9,258	(41,402)	853,589
Balance (in shares) at Sep. 26, 2020		43,648,671	43,648,671
Balance at Mar. 28, 2020		$ 716,002	$ 436	0	(48,626)	764,192
Balance (in shares) at Mar. 28, 2020			43,610,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		1,076	$ 0	1,076	0	0
Exercise of stock options (in shares)			14,180
Withholdings from vesting of restricted stock		(77)	$ 0	(77)	0	0
Withholdings from vesting of restricted stock (in shares)			(1,016)
Restricted stock activity		0	$ 0	0	0	0
Restricted stock activity (in shares)			12,287
Stock-based compensation expense		4,540	$ 0	4,540	0	0
Comprehensive income		11,737	0	0	3,581	8,156
Balance at Jun. 27, 2020		733,278	$ 436	5,539	(45,045)	772,348
Balance (in shares) at Jun. 27, 2020			43,636,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options		812	$ 0	812	0	0
Exercise of stock options (in shares)			12,811
Withholdings from vesting of restricted stock		(139)	$ 0	(139)	0	0
Withholdings from vesting of restricted stock (in shares)			(1,744)
Restricted stock activity		0	$ 0	0	0	0
Restricted stock activity (in shares)			1,428
Stock-based compensation expense		3,046	$ 0	3,046	0	0
Comprehensive income		84,884	0	0	3,643	81,241
Balance at Sep. 26, 2020		$ 821,881	$ 436	$ 9,258	$ (41,402)	$ 853,589
Balance (in shares) at Sep. 26, 2020		43,648,671	43,648,671
[1] The Company reclassified $1.5 million of tax benefits from "Accumulated other comprehensive loss" to "Retained earnings" for the tax effects resulting from the December 22, 2017 enactment of the Tax Cuts and Jobs Act in accordance with the adoption of ASU 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of fiscal 2019.

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