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Stock Based Compensation Expense (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Cliff Vest Ninety Days [Member]
Sep. 30, 2012
Cliff Vest One Year [Member]
Sep. 30, 2012
Cliff Vest Three Years [Member]
Mar. 31, 2012
Maximum [Member]
Jun. 30, 2012
Maximum [Member]
Sep. 30, 2012
Maximum [Member]
Mar. 31, 2012
Minimum [Member]
Jun. 30, 2012
Minimum [Member]
Sep. 30, 2012
Minimum [Member]
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2011
Stock Options [Member]
Sep. 30, 2012
Restricted Stock [Member]
Jun. 30, 2012
Restricted Stock [Member]
Mar. 31, 2012
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2011
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Sep. 30, 2012
Restricted Stock [Member]
Cliff Vest Ninety Days [Member]
Sep. 30, 2012
Restricted Stock [Member]
Cliff Vest Three Years [Member]
Sep. 30, 2011
Restricted Stock [Member]
Cliff Vest Three Years [Member]
Sep. 30, 2012
Restricted Stock Grants [Member]
Sep. 30, 2012
Incentive Stock Option Plan [Member]
Range One [Member]
Sep. 30, 2012
Incentive Stock Option Plan [Member]
Range Two [Member]
Sep. 30, 2012
Incentive Stock Option Plan [Member]
Maximum [Member]
Range Three [Member]
Sep. 30, 2012
Incentive Stock Option Plan [Member]
Minimum [Member]
Range Three [Member]
Stock Based Compensation Expense (Textual) [Abstract]                                                            
Granted an option to acquire shares, Shares                                0         247,536     7,000 227,184 4,000          
Exercise price of granted options , Price per option $ 0.00 $ 0.00 $ 0.00                                                      
Incentive Stock Option Plans, Option exercised 109,681 64,712 35,340                                                      
Forfeited option                                       1,367                    
Stock-based compensation expense                             $ 668 $ 678       $ 1,188 $ 885                  
Nonvested unamortized compensation expense, contractual term                             1 year 2 months 12 days         2 years 6 months                    
Nonvested unamortized compensation expense, value                             $ 1,116   $ 4,140     $ 4,140                    
Weighted Average Grant-Date Fair Value, Vested                                 $ 27.79 $ 24.58 $ 11.73 $ 14.13 $ 12.00                  
Fair value of granted share       $ 21.24 $ 11.38                       $ 27.55 $ 24.58 $ 20.45                      
Expenses recognized period           90 days 1 year 3 years                       3 years                    
Average vest date value Restricted share       $ 19.29 $ 13.87                                                  
Average vest date value forfeited share                                       $ 20.47                    
Restricted share were granted during period                                                   30,640        
Weighted Average Grant-Date Fair Value, Ending balance                                 $ 20.29 $ 19.55 $ 19.55 $ 20.29   $ 11.37                
Option Vested                                 (5,148) 12,204 82,640 99,992 130,040   13,352   26,640          
Options exercised, Lower Range                       $ 7.50 $ 7.50 $ 14.74                         $ 3.67 $ 7.50 $ 14.75 $ 11.32
Options exercised, Upper Range                 $ 14.74 $ 14.74 $ 14.99                                      
Restricted shares of common stock forfeited         4,536,000                          1,367