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Debt - Derivatives (Details) - USD ($)
3 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Debt    
Weighted average interest rate for Credit Facility borrowings, including the impact of interest rate swaps   2.10%
Interest paid $ 1,600,000 $ 1,300,000
Interest rate swap    
Debt    
Interest rate swap liabilities 5,600,000  
Interest rate swap | Interest expense    
Debt    
Portion of derivative liability that would be reclassified into earnings $ 723,000  
Estimate of period of time over which portion of derivative liability would be reclassified into earnings 12 months