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Employee Benefit Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Employee Benefit Plans (Textual) [Abstract]  
Contribution percentage of eligible employees 85.00%
Percentage of eligible employees of first 4% total employees 25.00%
Employee Stock Option [Member]
 
Employee Benefit Plans (Textual) [Abstract]  
Total unrecognized compensation cost related to nonvested stock-based employee compensation arrangements 6.2
Weighted average period expected to be recognized 3 years 7 months 21 days
Employee Stock Purchase Plan [Member]
 
Employee Benefit Plans (Textual) [Abstract]  
Number of common stock issued under plan 500,000
Percentage outstanding shares of common stock issued under plan 1.00%