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Interest Rate Swaps Schedule of Changes in AOCL Net of Tax (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]          
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion       $ (1,822)  
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion $ 59 $ 412 $ 270    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0 0 0  
Other Comprehensive Income (Loss), Net of Tax 36 251 165 (1,111) $ 1,392
Ending fiscal year AOCI balance $ 1,557 $ (1,111) $ 1,557 $ (1,111) $ 1,392