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Debt (Details 2) - USD ($)
3 Months Ended 9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 27, 2015
Sep. 28, 2014
Debt        
Weighted average interest rate for credit facility borrowings, including the impact of interest rate swaps 2.00% 1.80% 2.00% 1.70%
Interest paid $ 1,300,000 $ 1,000,000 $ 3,900,000 $ 2,600,000
Interest rate swap        
Debt        
Gain (loss) on cash flow hedge ineffectiveness 0   0  
Interest rate swap liabilities $ 2,400,000   2,400,000  
Interest rate swap | Interest expense        
Debt        
Portion of derivative liability that would be reclassified into earnings     $ 715,000  
Estimate of period of time over which portion of derivative liability would be reclassified into earnings     12 months