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Debt - Derivatives (Details) - USD ($)
3 Months Ended
Mar. 26, 2017
Mar. 27, 2016
Debt    
Weighted average interest rate for Credit Facility borrowings, including the impact of interest rate swaps 2.20% 2.10%
Interest paid $ 1,900,000 $ 1,600,000
Interest rate swap    
Debt    
Interest rate swap liabilities 1,200,000  
Interest rate swap | Interest expense    
Debt    
Portion of derivative liability that would be reclassified into earnings $ 200,000  
Estimate of period of time over which portion of derivative liability would be reclassified into earnings 12 months