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Stock Based Compensation (Details Textual)
Share data in Thousands, except Per Share data, unless otherwise specified |
12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 29, 2012
USD ($)
|
Dec. 31, 2011
USD ($)
|
Jan. 01, 2011
|
Dec. 29, 2012
Director Equity Plan [Member]
USD ($)
|
Dec. 31, 2011
Director Equity Plan [Member]
USD ($)
|
Dec. 29, 2012
2006 Stock Option Plan [Member]
|
Dec. 31, 2012
2006 Stock Option Plan [Member]
|
Dec. 29, 2012
2001 Restricted Stock Plan [Member]
USD ($)
|
Dec. 31, 2011
2001 Restricted Stock Plan [Member]
USD ($)
|
Jan. 01, 2011
2001 Restricted Stock Plan [Member]
USD ($)
|
Dec. 31, 2011
Equity Incentive Plan (2011 Plan) [Member]
|
Dec. 29, 2012
Nonemployee Director Equity and Deferred Compensation Plan [Member]
USD ($)
|
Dec. 31, 2011
Nonemployee Director Equity and Deferred Compensation Plan [Member]
|
Dec. 29, 2012
Employee Stock Purchase Plan [Member]
USD ($)
|
Dec. 31, 2011
Employee Stock Purchase Plan [Member]
|
Dec. 29, 2012
1996 Stock Option Plan [Member]
|
Dec. 31, 2012
1996 Stock Option Plan [Member]
|
Dec. 29, 2012
Maximum [Member]
2006 Stock Option Plan [Member]
|
Dec. 29, 2012
Maximum [Member]
Nonemployee Director Equity and Deferred Compensation Plan [Member]
|
Dec. 31, 2011
Maximum [Member]
Nonemployee Director Equity and Deferred Compensation Plan [Member]
|
Dec. 29, 2012
Maximum [Member]
1996 Stock Option Plan [Member]
|
Dec. 29, 2012
Minimum [Member]
Employee Stock Purchase Plan [Member]
|
Dec. 29, 2012
Minimum [Member]
Employee Stock Purchase Plan [Member]
United States [Member]
USD ($)
|
Dec. 31, 2011
Minimum [Member]
Employee Stock Purchase Plan [Member]
United Kingdom [Member]
GBP (£)
|
|
| Stock Option Plans (Textual) [Abstract] | ||||||||||||||||||||||||
| Shares available for issuance | 25,000 | 1,125,000 | 928,125 | 3,375,000 | 0 | 25,000 | ||||||||||||||||||
| Exercise price per share not less than fair value percent | 110.00% | 110.00% | ||||||||||||||||||||||
| Exercise price per share more than voting stock | 10.00% | 10.00% | ||||||||||||||||||||||
| Stock options maximum term (in years) | 10 years | 10 years | ||||||||||||||||||||||
| Minimum period before shares become non-forfeitable (in months) | 6 months | |||||||||||||||||||||||
| Restricted stock expense | $ 1,695,000 | $ 1,193,000 | $ 880,000 | |||||||||||||||||||||
| Plan Expiration year | 2011 | |||||||||||||||||||||||
| Share based Compensation Expenses under Director's plan | 451,000 | 264,000 | ||||||||||||||||||||||
| Remaining number of shares to be issued | 270,000 | 713,284 | 824,012 | |||||||||||||||||||||
| Rate of common stock at market value | 85.00% | |||||||||||||||||||||||
| Shares purchase by employees under ESPP | 72 | 63 | 53 | 35,264 | 29,056 | |||||||||||||||||||
| Aggregate shares of restricted stock grant | 89 | 88 | 69 | 1,000,000 | 1,096,875 | |||||||||||||||||||
| Shares allowed to be purchased by U.S. employees and U.K. employees | 25,000 | 1,500 | ||||||||||||||||||||||
| Allowable purchase rate of common stock based on annual salary | 10.00% | |||||||||||||||||||||||
| Weighted average price | $ 19.84 | $ 19.76 | ||||||||||||||||||||||
| Stock option granted, shares | 17,607 | 14,936 | 0 | 375 | ||||||||||||||||||||
| Cash fees paid | 3,000 | |||||||||||||||||||||||
| Fee for the chairs of each Board committee | 125.00% | 25.00% | ||||||||||||||||||||||
| Remaining number of shares to be issued | 256,749 | |||||||||||||||||||||||
| Common stock shares for each nonemployee director | 500 | |||||||||||||||||||||||
| Stock Option Plans (Additional Textual) [Abstract] | ||||||||||||||||||||||||
| Recognized compensation expense | 0 | 0 | ||||||||||||||||||||||
| Total unrecognized compensation | 3,651,000 | |||||||||||||||||||||||
| Recognized weighted average period (in years) | 1 year 6 months 15 days | |||||||||||||||||||||||
| Deferred stock units outstanding | 10,521 | |||||||||||||||||||||||
| Share based Compensation Expenses | $ 183,000 | $ 164,000 | ||||||||||||||||||||||
| Compensation ratio | 0.17 | |||||||||||||||||||||||