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Equity Incentive Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted shares 345,000  
Number of annual performance metrics 2  
Expected volatility rate 26.60%  
Beta of Portfolio 0.681  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 0.42%  
Share based compensation awards other than option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for the issuance of awards 438,603  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense $ 4.8 $ 3.2
Unrecognized compensation costs related to non vested stock option awards 16.1  
Expected weighted average period to recognize expense 2 years 10 months 24 days  
Vesting period 3 years  
Granted shares 345,060  
Restricted Stock [Member] | Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Restricted Stock [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
Vesting rights, percentage weighted towards earnings per share performance 75.00%  
Award vesting rights, percentage weighted towards capital performance targets 25.00%  
Employee Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Discount on purchase of Common Stock for employee from the current market price 5.00%  
Maximum Shares Authorized Under ESPP for Sale Offer to Eligible Employees 500,000  
Stock Issued During Period, Shares, Employee Stock Purchase Plans 7,010  
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense 1.0 1.8
Unrecognized compensation costs related to non vested stock option awards $ 1.5  
Expected weighted average period to recognize expense 1 year 8 months 0 days  
Performance Based Share [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted shares 92,810  
Performance Based Share [Member] | Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage of target 0.00%  
Performance Based Share [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage of target 200.00%  
Stock Incentive Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for the issuance of awards 1,723,899