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Long-Term Debt (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jul. 01, 2015
Jun. 25, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Maturity date Mar. 30, 2020    
Losses on early extinguishment of debt $ 266 $ (1)  
Secured Debt [Member]      
Line of Credit Facility [Line Items]      
Losses on early extinguishment of debt 300    
Senior secured revolver [Member]      
Line of Credit Facility [Line Items]      
Line of credit facility, current borrowing capacity 250,000    
Accordion feature that allows increase in size of facility $ 325,000    
Commitment fee for unused portion of revolving credit facility (in hundredths) 0.20%    
Outstanding amount under credit facility $ 142,000    
Availability under the revolving facility $ 84,000    
Weighted-average interest rate (in hundredths) 1.69%   2.17%
Basis spread on variable rate debt 1.50%    
Letter of Credit [Member]      
Line of Credit Facility [Line Items]      
Line of credit facility, current borrowing capacity $ 30,000    
Outstanding amount of letters of credit $ 24,000    
Interest Rate Cap [Member] | Interest Rate Cap 2013-2014 [Member]      
Line of Credit Facility [Line Items]      
Interest rate cap, basis spread on variable rate (percent) 2.00%    
Derivative, notional amount $ 125,000    
Interest Rate Cap [Member] | Interest Rate Cap 2014-2015 [Member]      
Line of Credit Facility [Line Items]      
Interest rate cap, basis spread on variable rate (percent) 2.00%    
Derivative, notional amount $ 150,000    
Interest Rate Swap [Member]      
Line of Credit Facility [Line Items]      
Interest rate swaps, net 3,100    
Interest rate swaps asset 3,300    
Interest rate swaps liability $ 200    
Interest Rate Swap [Member] | Senior secured revolver [Member]      
Line of Credit Facility [Line Items]      
Weighted-average interest rate (in hundredths) 2.48%    
Interest Rate Swap [Member] | Interest Rate Swaps 2015-2018 [Member]      
Line of Credit Facility [Line Items]      
Derivative, notional amount $ 120,000    
Average fixed interest rate on interest rate swaps 2.63%    
Interest Rate Swap [Member] | Interest Rate Swaps 2018-2025 [Member]      
Line of Credit Facility [Line Items]      
Derivative, notional amount $ 120,000    
Average fixed interest rate on interest rate swaps 3.936%