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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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