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Stock Based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 3 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Performance Based RSUs [Member]
Dec. 31, 2011
Time Based Restricted Stock Unit [Member]
Oct. 31, 2010
Additional Restricted Stock Units [Member]
Oct. 31, 2010
Restricted Stock Units (RSUs) [Member]
Vote
Jun. 30, 2012
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2011
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2011
Restricted Stock Units (RSUs) [Member]
Chief Executive Officer [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Time Based RSUs [Member]
Oct. 31, 2010
Restricted Stock Units (RSUs) [Member]
Maximum [Member]
Oct. 31, 2010
Restricted Stock Units (RSUs) [Member]
Minimum [Member]
Dec. 31, 2010
Restricted Stock Grants [Member]
Jun. 30, 2012
Restricted Stock Grants [Member]
Jun. 30, 2011
Restricted Stock Grants [Member]
Dec. 31, 2010
Restricted Stock Grants [Member]
Maximum [Member]
2006 Plan [Member]
Dec. 31, 2010
Restricted Stock Grants [Member]
Minimum [Member]
2006 Plan [Member]
Stock Based Compensation (Textual) [Abstract]                                
Restricted stock units (RSUs), Granted    32,894   4,482 34,566       21,931              
Restricted stock immediately vested               7,601                
Restricted stock units fair value per unit   31.18 31.18 32.12 30.79                      
RSUs vest period         3 years                      
Actual amount of RSUs earned based on cumulative earnings         60.00%                      
Performance cycle         3 years                      
Target RSUs granted range                   150.00% 0.00%          
Remaining Time based RSUs         40.00%                      
RSUs Voting Right of common stock         0                      
Compensation expense related to restricted stock           $ 0.7 $ 0.1                  
Restricted Stock Issuable To Eligible Board of Directors Members Annually           2,000                    
Restricted stock issued                         16,000 16,000    
Restricted stock issued, par value                         $ 37.50 $ 33.49    
Restricted Stock Grants Vest Percentage                           50.00%    
Restricted stock grants vest period                           2 years    
Restricted stock issued to officers and certain employees, range                             $ 32.12 $ 30.79
Restricted stock grants vest over grant period                       3 years        
Compensation expense recognized on grant date                       3 years        
Compensation expense related to restricted stock grants                         $ 0.4 $ 0.8    
Share Based Compensation Arrangement By Share Based Payment Issued As Restricted Stock Unit                       26,000