Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Cumulative effect of accounting principle adoption of ASU 2016-01		$ 5,481	$ (5,481)
Balance, at Dec. 30, 2017	$ 9,949	1,127,872	5,880	$ (150,857)	$ 992,844
Balance, shares at Dec. 30, 2017	33,047,807			6,149,364
Net income		16,191			16,191
Other comprehensive income (loss), net of reclassification adjustments and tax			(365)		(365)
Dividends paid		(8,068)			(8,068)
Balance, at Mar. 31, 2018	$ 9,949	1,141,474	34	$ (150,857)	1,000,600
Balance, shares at Mar. 31, 2018	33,047,807			6,149,364
Balance, at Dec. 29, 2018	$ 9,949	1,163,545	262	$ (150,857)	1,022,899
Balance, shares at Dec. 29, 2018	33,047,807			6,149,364
Net income		14,304			14,304
Other comprehensive income (loss), net of reclassification adjustments and tax			621		621
Dividends paid		(8,339)			(8,339)
Balance, at Mar. 30, 2019	$ 9,949	$ 1,169,510	$ 883	$ (150,857)	$ 1,029,485
Balance, shares at Mar. 30, 2019	33,047,807			6,149,364