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Stock-Based Compensation (Details Textual)
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6 Months Ended | 6 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2012
USD ($)
Ratio
|
Jul. 02, 2011
|
Jun. 30, 2012
United Kingdom [Member]
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Jun. 30, 2012
2006 Stock Option Plan [Member]
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Jun. 30, 2012
2001 Restricted Stock Plan [Member]
USD ($)
|
Jul. 02, 2011
2001 Restricted Stock Plan [Member]
USD ($)
|
Jun. 30, 2012
Equity Incentive Plan (2011 Plan) [Member]
|
Jun. 30, 2012
Nonemployee Director Equity and Deferred Compensation Plan [Member]
USD ($)
|
Jul. 02, 2011
Nonemployee Director Equity and Deferred Compensation Plan [Member]
USD ($)
|
Jun. 30, 2012
Employee Stock Purchase Plan [Member]
USD ($)
|
Jul. 02, 2011
Employee Stock Purchase Plan [Member]
USD ($)
|
Jul. 30, 2012
Employee Stock Purchase Plan [Member]
|
Jun. 30, 2012
Nonemployee Director Fees Plan 2012 [Member]
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Jul. 02, 2011
Nonemployee Director Fees Plan 2012 [Member]
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Jun. 30, 2012
Maximum [Member]
2006 Stock Option Plan [Member]
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Jun. 30, 2012
Maximum [Member]
Employee Stock Purchase Plan [Member]
|
Jun. 30, 2012
Maximum [Member]
Employee Stock Purchase Plan [Member]
United States [Member]
USD ($)
|
Jun. 30, 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 | |||||||||||||||
| Share-based compensation shares granted | 8,266 | 7,468 | ||||||||||||||||
| 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 | $ 835,000 | $ 518,000 | ||||||||||||||||
| Aggregate shares of restricted stock grant | 1,000,000 | 0 | ||||||||||||||||
| 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 | $ 18.92 | $ 19.05 | ||||||||||||||||
| 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 | 101,000 | 105,000 | ||||||||||||||||
| Remaining number of shares to be issued | 911,162 | 179,409 | 730,955 | 265,625 | ||||||||||||||
| Recognized director compensation expense | 218,000 | 512,000 | ||||||||||||||||
| Additional free shares for every six shares purchased | 0.167 | |||||||||||||||||
| ESPP authorized shares issuance and the purchase by employees | 14,405 | 17,593 | 1,096,875 | |||||||||||||||
| Shares paid to directors who are not officers of the company | 375 | |||||||||||||||||
| Stock-Based Compensation (Additional Textual) [Abstract] | ||||||||||||||||||
| Total unrecognized compensation | 2,378,000 | |||||||||||||||||
| Recognized weighted average period (in years) | 1 year 3 months 15 days | |||||||||||||||||
| Cash fees paid | $ 3,000 | |||||||||||||||||
| Deferred stock units outstanding | 10,056 | |||||||||||||||||