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Stock Incentive Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Installment
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Incentive Plans (Textual) [Abstract]        
Options issued to outside consultants or advisors 0      
Options granted 0 0 0  
Number of shares of common stock reserved for issuance under the 2009 Plan 1,000,000      
Aggregate number of shares for which incentive stock options may be granted under the Plan 586,900      
Option awards shares outstanding under the 2009 plan together with the 2003 Plan and its predecessor 538,697 671,294 399,569 315,319
Outstanding options expiration period from the date of grant 10 years      
Restricted stock units, granted 47,500      
Fair value of restricted stock units, granted $ 21.44      
Unrecognized compensation expense related to stock options $ 2.6      
Weighted average period 4 years 4 months 24 days      
Number of equal installment in which restricted stock units vest 4      
Annual Installments for vesting of restricted stock beginning from date of grant, period 1 year