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Shareholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 05, 2020 | Dec. 20, 2019 | Jul. 10, 2019 | Dec. 21, 2018 | Jun. 29, 2018 | Dec. 22, 2017 | Jun. 30, 2017 | Dec. 31, 2012 | Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017 | Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future issuance under the plans |  |  |  |  |  |  |  |  | 1,466,084 |  |  |
Stock repurchase authorized |  |  |  |  |  |  |  |  | $ 142,200,000 |  |  | $ 5,000,000
Additional stock repurchase authorized |  |  |  |  |  |  |  |  | 137,200,000 |  |  |
Amount available under repurchase plan |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Total cost |  |  |  |  |  |  |  |  | 5,283,000 | $ 1,204,000 | $ 11,298,000 |
Cumulative purchases |  |  |  |  |  |  |  |  | $ 140,500,000 |  |  |
Dividend declared |  |  |  |  |  |  |  | $ 0.10 | $ 0.36 | $ 0.34 | $ 0.30 |
Dividend payment |  | $ 5,800,000 | $ 5,800,000 | $ 5,400,000 | $ 5,400,000 | $ 4,700,000 | $ 4,600,000 |  | $ 11,567,000 | $ 10,818,000 | $ 9,288,000 |
Dividends payable, date of record |  | Dec. 20, 2019 | Jul. 10, 2019 | Dec. 21, 2018 | Jun. 29, 2018 | Dec. 22, 2017 | Jun. 30, 2017 |  |  |  |  |
Dividend declared, month of payment |  |  |  |  |  |  |  |  | 2020-01 |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 28,000 |  |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 16.25 |  |  |
Total cost |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
Executive Team [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares to cover withholding taxes |  |  |  |  |  |  |  |  |  | 73,000 |  |
Value of purchased shares to cover withholding taxes |  |  |  |  |  |  |  |  |  | $ 1,300,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized | $ 147,200,000 |  |  |  |  |  |  |  |  |  |  |
Additional stock repurchase authorized | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend declared | $ 0.38 |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 339,000 | 68,000 |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 15.60 | $ 17.82 |  |
Total cost |  |  |  |  |  |  |  |  | $ 5,300,000 | $ 1,200,000 |  |
Cumulative [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 27,400,000 | 27,000,000 |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 5.1 | $ 5.1 |  |
Tax Withholding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld and not issued |  |  |  |  |  |  |  |  | 132,000 | 205,000 |  |
Cost of shares withheld and not issued |  |  |  |  |  |  |  |  | $ 2,500,000 | $ 3,600,000 |  |
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 |  |  |  |  |  |  |  |  | 105,252 |  |  |
Shares issued under ESPP |  |  |  |  |  |  |  |  | 51,548 | 55,045 | 67,761 |
Proceeds from ESPP |  |  |  |  |  |  |  |  | $ 800,000 | $ 800,000 | $ 1,000,000 |
Additional shares authorized |  |  |  |  |  |  |  |  | 250,000 |  |  |
Number of shares available for future issuance under the plans |  |  |  |  |  |  |  |  | 279,606 |  |  |

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