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Equity Incentive Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Equity Incentive Plans (Additional Textual) [Abstract]    
Granted shares 345,000  
Number of annual performance metrics 2  
Expected volatility rate 26.60%  
Beta of Portfolio 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]
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Common stock available for the issuance of awards 404,104  
Restricted Stock [Member]
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Share based compensation expense $ 2.6 $ 2.1
Unrecognized compensation costs related to non vested stock option awards 18.2  
Expected weighted average period to recognize expense 3 years 1 month 6 days  
Granted shares 345,060  
Vesting period 3 years  
Restricted Stock [Member] | Minimum
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Vesting period 3 years  
Restricted Stock [Member] | Maximum
   
Equity Incentive Plans (Additional Textual) [Abstract]    
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 Purchase Plan [Member]
   
Equity Incentive Plans (Additional Textual) [Abstract]    
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 4,625  
Stock Options [Member]
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Share based compensation expense 0.7 1.4
Unrecognized compensation costs related to non vested stock option awards $ 1.8  
Expected weighted average period to recognize expense 1 year 10 months 2 days  
Performance Based Share [Member]
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Granted shares 92,810  
Performance Based Share [Member] | Minimum
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Vesting percentage of target 0.00%  
Performance Based Share [Member] | Maximum
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Vesting percentage of target 200.00%  
Stock Incentive Plan [Member]
   
Equity Incentive Plans (Additional Textual) [Abstract]    
Common stock available for the issuance of awards 1,704,344