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Shareholders' Equity (Narrative) (Details) - USD ($)				3 Months Ended							9 Months Ended		12 Months Ended
	Oct. 09, 2020	Sep. 26, 2020	Jul. 10, 2020	Sep. 25, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Sep. 25, 2020	Sep. 27, 2019	Dec. 27, 2019
Equity, Class of Treasury Stock [Line Items]
Total cost						$ 1,006,000			$ 1,440,000	$ 1,616,000
Amount available under repurchase plan				$ 4,700,000							$ 4,700,000
Stock repurchase authorized				$ 147,200,000							$ 147,200,000
Shares repurchased for employee net vesting obligations, shares				8,000				5,000			135,000	129,000
Shares repurchased for employee net vesting obligations, value				$ 111,000				$ 88,000			$ 2,100,000	$ 2,500,000
Dividend declared						$ 0.38
Dividend payment			$ 3,100,000	$ 3,024,000	$ 3,050,000	$ 13,000	$ 5,800,000		$ 5,789,000
Dividends payment, nature											During the second quarter of 2020, the Company announced its transition to a quarterly dividend payment cycle, subject to declaration.
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend payment	$ 3,100,000
Dividends payable, date declared		Dec. 18, 2020
Dividends payable, payment date		Jan. 09, 2021
Minimum [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared													$ 0.34
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared													$ 0.36
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock				75,000							148,000	193,000
Purchase price per share				$ 12.41							$ 13.09	$ 15.80
Total cost				$ 900,000							$ 1,900,000	$ 3,100,000
Stock Appreciation Rights (“SARs”) [Member]
Equity, Class of Treasury Stock [Line Items]
SARs outstanding				2,900,000							2,900,000
Exercise price				$ 4.00							$ 4.00
Expiration date											Feb. 08, 2022

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