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Shareholders' Equity (Details) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 08, 2019 | Dec. 21, 2018 | Jun. 29, 2018 | Dec. 22, 2017 | Jun. 30, 2017 | May 06, 2016 | May 05, 2016 | Dec. 31, 2012 | Dec. 28, 2018 | Dec. 29, 2017 | Dec. 30, 2016 | Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for future issuance under the plans |  |  |  |  |  |  |  |  | 1,798,440 |  |  |
Stock repurchase authorized |  |  |  |  |  |  |  |  | $ 142,200,000 |  |  | $ 5,000,000
Additional stock repurchase authorized |  |  |  |  |  |  |  |  | 137,200,000 |  |  |
Amount available under repurchase plan |  |  |  |  |  |  |  |  | 6,900,000 |  |  |
Repurchase of common stock |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Purchase price per share |  |  |  |  |  | $ 14.77 |  |  |  |  |  |
Total cost |  |  |  |  |  |  |  |  | 1,204,000 | $ 11,298,000 | $ 30,065,000 |
Cumulative purchases |  |  |  |  |  |  |  |  | $ 135,300,000 |  |  |
Weighted average shares outstanding |  |  |  |  |  | 4.00% | 11.00% |  |  |  |  |
Weighted average shares outstanding accretive on an annualized basis |  |  |  |  |  | $ 0.04 | $ 0.03 |  |  |  |  |
Dividend declared |  |  |  |  |  |  |  | $ 0.10 | $ 0.34 | $ 0.30 | $ 0.26 |
Dividend payment |  | $ 5,400,000 | $ 5,400,000 | $ 4,700,000 | $ 4,600,000 |  |  |  | $ 10,818,000 | $ 9,288,000 | $ 7,988,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount available under repurchase plan | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Dividend declared | $ 0.36 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  | 697,000 |  |  |  |  |  |
Beneficial owners |  |  |  |  |  | 11.80% |  |  |  |  |  |
Chief Executive Officer [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 |  |  |
Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  | 732,000 |  |  |  |  |  |
Beneficial owners |  |  |  |  |  | 4.90% |  |  |  |  |  |
Chief Operating Officer [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 |  |  |
Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  | 73,000 |  |  |  |  |  |
Beneficial owners |  |  |  |  |  | 0.90% |  |  |  |  |  |
Chief Financial Officer [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 |  |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 68,000 | 748,000,000 |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 17.82 | $ 15.11 |  |
Total cost |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 11,300,000 |  |
Share Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | 32,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price per share | $ 15.84 |  |  |  |  |  |  |  |  |  |  |
Total cost | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan [Member] | Director [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | 28,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price per share | $ 16.25 |  |  |  |  |  |  |  |  |  |  |
Total cost | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan [Member] | Executive Team [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock | 28,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price per share | $ 16.25 |  |  |  |  |  |  |  |  |  |  |
Cumulative [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 27,000,000 | 26,900,000 |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 5.0 | $ 5.0 |  |
Tax Withholding [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld and not issued |  |  |  |  |  |  |  |  | 205,000 | 268,000 |  |
Cost of shares withheld and not issued |  |  |  |  |  |  |  |  | $ 3,600,000 | $ 4,400,000 |  |
Tax Withholding [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld and not issued | 143,000 |  |  |  |  |  |  |  |  |  |  |
Cost of shares withheld and not issued | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 156,800 |  |  |
Shares issued under ESPP |  |  |  |  |  |  |  |  | 55,045 | 67,761 | 67,111 |
Proceeds from ESPP |  |  |  |  |  |  |  |  | $ 800,000 | $ 1,000,000 | $ 1,000,000 |
Additional shares authorized |  |  |  |  |  |  |  |  | 250,000 |  |  |
Number of shares available for future issuance under the plans |  |  |  |  |  |  |  |  | 279,606 |  |  |

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