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Shareholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 02, 2021 | Dec. 18, 2020 | Sep. 25, 2020 | Jun. 30, 2020 | Dec. 20, 2019 | Jul. 10, 2019 | Dec. 21, 2018 | Jun. 29, 2018 | Dec. 27, 2019 | Dec. 31, 2012 | Jan. 01, 2021 | Dec. 27, 2019 | Dec. 28, 2018 | Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future issuance under the plans |  |  |  |  |  |  |  |  |  |  | 2,052,508 |  |  |
Stock repurchase authorized |  |  |  |  |  |  |  |  |  |  | $ 147,200,000 |  |  | $ 5,000,000.0
Additional stock repurchase authorized |  |  |  |  |  |  |  |  |  |  | 142,200,000 |  |  |
Amount available under repurchase plan |  |  |  |  |  |  |  |  |  |  | 4,300,000 |  |  |
Cumulative purchases |  |  |  |  |  |  |  |  |  |  | 142,900,000 |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  | 2,367,000 | $ 5,283,000 | $ 1,204,000 |
Cumulative cash used to repurchase of stock |  |  |  |  |  |  |  |  |  |  | $ 4,508,000 | $ 7,807,000 | $ 4,786,000 |
Dividend declared |  |  |  |  |  |  |  |  |  | $ 0.10 | $ 0.38 | $ 0.36 | $ 0.34 |
Dividends payable, date of record |  | Dec. 18, 2020 | Sep. 25, 2020 | Jun. 30, 2020 | Dec. 20, 2019 | Jul. 10, 2019 | Dec. 21, 2018 | Jun. 29, 2018 |  |  |  |  |  |
Dividend payment |  | $ 9,100,000 | $ 9,100,000 | $ 9,100,000 | $ 11,200,000 | $ 11,200,000 | $ 10,800,000 | $ 10,800,000 | $ 5,800,000 |  | $ 9,147,000 | $ 11,567,000 | $ 10,818,000 |
Dividend payable, year |  | 2020 | 2020 | 2020 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared | $ 0.40 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, date of record | Mar. 26, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend payment date | Apr. 08, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of dividend | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | First Quarter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  | 37,000 |  |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  | $ 17.43 |  |  |
Total cost |  |  |  |  |  |  |  |  |  |  | $ 700,000 |  |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  | 184,000 | 339,000 |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  | $ 12.84 | $ 15.60 |  |
Total cost |  |  |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 5,300,000 |  |
Cumulative [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  |  | 27,600,000 | 27,400,000 |  |
Purchase price per share |  |  |  |  |  |  |  |  |  |  | $ 5.19 | $ 5.14 |  |
Tax Withholding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld and not issued |  |  |  |  |  |  |  |  |  |  | 139,000 | 132,000 |  |
Cost of shares withheld and not issued |  |  |  |  |  |  |  |  |  |  | $ 2,100,000 | $ 2,500,000 |  |
Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of eligible compensation allowed, per grant purchase |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Interval between employee stock purchases |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |
Employee purchase price as percentage of trading value |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |
Aggregate fair market value of shares purchased by an employee |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |
Employee stock purchase plan, expiration date |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2023 |  |  |
Total number of shares available for purchase under the plans |  |  |  |  |  |  |  |  |  |  | 73,573 |  |  |
Shares issued under ESPP |  |  |  |  |  |  |  |  |  |  | 56,679 | 51,548 | 55,045 |
Proceeds from ESPP |  |  |  |  |  |  |  |  |  |  | $ 800,000 | $ 800,000 | $ 800,000 |
Additional shares authorized |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |
Number of shares available for future issuance under the plans |  |  |  |  |  |  |  |  |  |  | 279,606 |  |  |

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