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v3.3.1.900

Shareholders' Equity (Details) - USD ($) |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended | 156 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2015 | Jun. 29, 2015 | Dec. 10, 2014 | Oct. 15, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 14, 2016 | Mar. 14, 2016 | Jan. 01, 2016 | Dec. 31, 2015 | Jan. 02, 2015 | Dec. 31, 2014 | Dec. 27, 2013 | Jan. 02, 2015 | Sep. 26, 2013 | Aug. 28, 2013 | Jul. 30, 2002
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 | $ 95,000,000 |  |  |  |  |  |  |  | $ 5,000,000
Common stock, par value |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |  |  |
Stock repurchase cost of tender offer net of fees and expenses related to tender offer |  |  |  |  |  |  |  |  | $ 1,400,000 |  | $ 11,000,000 |  | $ 7,170,000 |  |  |  |
Percentage of eligble compensation allowed, per grant purchase |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Interval between employee stock purchases |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Employee purchase price as percentage of trading value |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |
Annual share repurchase authorized, value |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |
Employee stock purchase plan, expiration date |  |  |  |  |  |  |  |  | Jul. 01, 2018 |  |  |  |  |  |  |  |
Common stock available for issuance employee stock purchase plans |  |  |  |  |  |  |  |  | 4,275,000 |  |  |  |  |  |  |  |
Shares available for issuance, per offering period |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |
Shares issued under ESPP |  |  |  |  |  |  |  |  | 48,356 |  | 94,333 |  | 113,905 |  |  |  |
Additional stock repurchase authorized |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  | $ 90,000,000 |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | 100,000 |  | 1,800,000 |  |  |  |  |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 9.10 |  | $ 6.07 |  |  |  |  |  |
Total cost |  |  |  |  |  |  |  |  | $ 1,356,000 |  | $ 10,929,000 |  | $ 5,962,000 |  |  |  |
Cumulative purchases |  |  |  |  |  |  |  |  | 92,700,000 |  |  |  |  |  |  |  |
Amount available under repurchase plan |  |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |
Dividend declared |  |  |  |  |  | $ 0.10 |  |  | $ 0.20 | $ 0.20 |  | $ 0.12 |  |  |  |  |
Annual dividend |  |  |  |  |  |  | $ 0.26 |  |  |  |  |  |  |  |  |  |
Annual cash dividend per share |  |  | $ 0.12 |  | $ 0.10 | $ 0.10 |  |  |  |  |  |  |  |  |  |  |
Dividend payment | $ 3,200,000 | $ 3,100,000 | $ 3,500,000 |  | $ 3,100,000 | $ 3,100,000 |  |  | $ 6,266,000 |  | $ 3,508,000 |  | $ 3,096,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of service qualification |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |
2013 Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 | $ 35,750,000 |
Common stock, par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 |
Number of stock repurchased in tender offer |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share repurchased in tender offer |  |  |  | $ 7.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase cost of tender offer net of fees and expenses related to tender offer |  |  |  | $ 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of issued and outstanding shares repurchased in tender offer |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2013 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized, per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.50 | 5.75 |
2013 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase authorized, per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.00 | $ 6.50 |
Tax Withholding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock held |  |  |  |  |  |  | 253,000 | 253,000 | 297,000 |  | 435,000 |  |  | 435,000 |  |  |
Treasury shares withheld and not issued |  |  |  |  |  |  | $ 3,500,000 | $ 3,500,000 | $ 2,500,000 |  | $ 2,700,000 |  |  | $ 2,700,000 |  |  |
Cumulative [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price per share |  |  |  |  |  |  |  |  | $ 3.84 |  | $ 3.81 |  |  |  |  |  |
Treasury stock held |  |  |  |  |  |  |  |  | 24,100,000 |  | 24,000,000 |  |  | 24,000,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |
Purchase price per share |  |  |  |  |  |  | $ 13.83 |  |  |  |  |  |  |  |  |  |
Total cost |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |
Amount available under repurchase plan |  |  |  |  |  |  | $ 3,100,000 | $ 3,100,000 |  |  |  |  |  |  |  |  |
Annual dividend |  |  |  |  |  |  | $ 0.26 |  |  |  |  |  |  |  |  |  |

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