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Long-Term Debt (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 28, 2017
Dec. 28, 2016
Line of Credit Facility [Line Items]    
Interest rate swaps, net liability $ 4,300  
Interest rate swaps, asset 100  
Interest rate swaps, liability 4,400  
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 3.13%  
Interest Rate Swaps 2018-2025 [Member]    
Line of Credit Facility [Line Items]    
Derivative, notional amount $ 170,000  
Average fixed interest rate on interest rate swaps 4.44%  
Interest Rate Swaps 2018-2026 [Member]    
Line of Credit Facility [Line Items]    
Derivative, notional amount $ 50,000  
Average fixed interest rate on interest rate swaps 4.46%  
Senior secured revolver [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, current borrowing capacity $ 325,000  
Outstanding amount under credit facility 235,000  
Availability under the revolving facility $ 68,300  
Weighted-average interest rate (in hundredths) 3.13% 2.45%
Commitment fee for unused portion of revolving credit facility (in hundredths) 0.30%  
Basis spread on variable rate debt 2.00%  
Maturity date Mar. 30, 2020  
Senior secured revolver [Member] | Interest Rate Swap [Member]    
Line of Credit Facility [Line Items]    
Weighted-average interest rate (in hundredths) 3.17% 2.74%
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 $ 21,700