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Stock Based Compensation Expense (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2011
Stock Based Compensation Expense (Textual) [Abstract]            
Granted an option to acquire shares, Shares              
Exercise price of granted options , Price per option              
Contractual Term, Vested option     3 years      
Incentive Stock Option Plans, Option exercised 64,712 35,340        
Stock-based compensation expense       $ 438    
Expiration period     3 years      
Fair value of granted share     $ 20.45      
Average vest date value Restricted share     $ 17.58      
Options exercised, Lower Range     $ 11.32      
Restricted shares of common stock forfeited       3,886,000    
Maximum [Member]
           
Stock Based Compensation Expense (Textual) [Abstract]            
Options exercised, Lower Range     $ 14.99      
Options exercised, Upper Range     $ 14.74      
Minimum [Member]
           
Stock Based Compensation Expense (Textual) [Abstract]            
Options exercised, Lower Range     $ 7.50      
Stock Options [Member]
           
Stock Based Compensation Expense (Textual) [Abstract]            
Granted an option to acquire shares, Shares     0      
Stock-based compensation expense     432      
Nonvested unamortized compensation expense, contractual term     1 year 6 months      
Nonvested unamortized compensation expense, value 1,346   1,346      
Restricted Stock [Member]
           
Stock Based Compensation Expense (Textual) [Abstract]            
Granted an option to acquire shares, Shares     207,184   0  
Forfeited option     1,367      
Stock-based compensation expense     599 626    
Nonvested unamortized compensation expense, contractual term     2 years 8 months 12 days      
Nonvested unamortized compensation expense, value $ 3,937   $ 3,937      
Fair value of granted share    $ 20.45        
Expenses recognized period     3 years      
Average vest date value forfeited share     $ 20.47      
Weighted Average Grant-Date Fair Value, Ending balance $ 19.55 $ 19.55 $ 19.55     $ 11.37
Option Vested    82,640 82,640      
Restricted shares of common stock forfeited 1,367           
Restricted Stock Grants [Member]
           
Stock Based Compensation Expense (Textual) [Abstract]            
Restricted share were Granted During period     0