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Stock-Based Compensation (Details Textual)
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9 Months Ended | 9 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 29, 2012
USD ($)
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Oct. 01, 2011
|
Sep. 29, 2012
United Kingdom [Member]
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Sep. 29, 2012
2006 Stock Option Plan [Member]
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Sep. 29, 2012
2001 Restricted Stock Plan [Member]
USD ($)
|
Oct. 01, 2011
2001 Restricted Stock Plan [Member]
USD ($)
|
Sep. 29, 2012
Equity Incentive Plan (2011 Plan) [Member]
|
Sep. 29, 2012
Nonemployee Director Equity and Deferred Compensation Plan [Member]
USD ($)
|
Oct. 01, 2011
Nonemployee Director Equity and Deferred Compensation Plan [Member]
USD ($)
|
Sep. 29, 2012
Employee Stock Purchase Plan [Member]
USD ($)
|
Oct. 01, 2011
Employee Stock Purchase Plan [Member]
USD ($)
|
Sep. 29, 2012
Nonemployee Director Fees Plan 2012 [Member]
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Oct. 01, 2011
Nonemployee Director Fees Plan 2012 [Member]
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Sep. 29, 2012
Maximum [Member]
2006 Stock Option Plan [Member]
|
Sep. 29, 2012
Maximum [Member]
Employee Stock Purchase Plan [Member]
|
Sep. 29, 2012
Maximum [Member]
Employee Stock Purchase Plan [Member]
United States [Member]
USD ($)
|
Sep. 29, 2012
Maximum [Member]
Employee Stock Purchase Plan [Member]
United Kingdom [Member]
GBP (£)
|
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| Stock-Based Compensation (Textual) [Abstract] | |||||||||||||||||
| Shares available for issuance | 1,125,000 | 928,125 | 25,000 | 12,676 | 11,207 | ||||||||||||
| Exercise price per share not less than fair value percent | 110.00% | ||||||||||||||||
| Exercise price per share more than voting stock | 10.00% | ||||||||||||||||
| Stock options maximum term (in years) | 10 years | ||||||||||||||||
| Minimum period before shares become non-forfeitable (in months) | 6 months | ||||||||||||||||
| Restricted stock expense | $ 1,176,000 | $ 776,000 | |||||||||||||||
| Aggregate shares of restricted stock grant | 0 | 1,000,000 | 722,666 | ||||||||||||||
| Rate of common stock at market value | 85.00% | ||||||||||||||||
| 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 | $ 19.55 | $ 20.86 | |||||||||||||||
| Share-based compensation common stock-shares issued | 270,000 | 270,000 | |||||||||||||||
| Shares paid to directors | 500 | ||||||||||||||||
| Fee for the chairs of each Board committee | 25.00% | 125.00% | |||||||||||||||
| Recognized compensation expense | 129,000 | 135,000 | |||||||||||||||
| Remaining number of shares to be issued | 0 | 179,375 | 912,462 | 261,249 | |||||||||||||
| Recognized director compensation expense | 349,000 | 30,000 | |||||||||||||||
| ESPP authorized shares issuance and the purchase by employees | 19,550 | 25,882 | 1,096,875 | ||||||||||||||
| Shares paid to directors who are not officers of the company | 375 | ||||||||||||||||
| Stock-Based Compensation (Additional Textual) [Abstract] | |||||||||||||||||
| Total unrecognized compensation | 1,925,000 | ||||||||||||||||
| Recognized weighted average period (in years) | 1 year 18 days | ||||||||||||||||
| Cash fees paid | $ 3,000 | ||||||||||||||||
| Deferred stock units outstanding | 10,090 | ||||||||||||||||