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Revolving Credit Facility (Details)
$ in Thousands
6 Months Ended
Jul. 03, 2015
USD ($)
item
Jun. 30, 2014
Revolving credit facility    
Effective interest rate (as a percent) 2.58% 2.39%
Revolving Credit Facility.    
Revolving credit facility    
Revolving credit limit $ 175,000  
Potential future expansion of the Facility under accordion feature $ 250,000  
EBITDA multiplier | item 3.5  
Borrowing capacity permitted to be used per formula $ 80,700  
Irrevocable letters of credit outstanding 9,800  
Remaining borrowing capacity available for use 70,900  
Minimum net worth required to be maintained $ 172,200  
Revolving Credit Facility. | Prime rate    
Revolving credit facility    
Variable rate basis Bank's prime rate plus a margin  
Revolving Credit Facility. | LIBOR    
Revolving credit facility    
Variable rate basis LIBOR  
Revolving Credit Facility. | LIBOR | Minimum    
Revolving credit facility    
Interest rate margin per debt instrument (as a percent) 1.75%  
Revolving Credit Facility. | LIBOR | Maximum    
Revolving credit facility    
Interest rate margin per debt instrument (as a percent) 3.00%