Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 28, 2018	$ 751,873	$ 165,171	$ 510,825	$ 220,734	$ (144,857)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued	23,579	1,193	22,386	0	0
Stock compensation cost	5,856	0	5,856	0	0
Net Earnings	86,749	0	0	86,749	0
Dividends declared	(26,445)	0	0	(26,445)	0
Other comprehensive income (loss)	2,826	0	0	0	2,826
Ending Balance at Mar. 29, 2019	844,438	166,364	539,067	281,038	(142,031)
Beginning Balance at Dec. 27, 2019	1,024,931	167,287	578,440	448,991	(169,787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued	37,087	1,620	35,467
Shares repurchased	(90,029)	(2,067)	(7,143)	(80,819)
Stock compensation cost	5,934		5,934
Net Earnings	72,818			72,818
Dividends declared	(29,540)			(29,540)
Other comprehensive income (loss)	(2,543)				(2,543)
Ending Balance at Mar. 27, 2020	$ 1,018,658	$ 166,840	$ 612,698	$ 411,450	$ (172,330)