Long-Term Debt and Credit Arrangements (Interest payments and debt maturities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Debt Instrument [Line Items]
Interest paid	$ 5,088	$ 4,449	$ 3,757
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	10,122
Long-term Debt, Maturities, Repayments of Principal in Year Two	7,699
Long-term Debt, Maturities, Repayments of Principal in Year Three	4,710
Long-term Debt, Maturities, Repayments of Principal in Year Four	3,543
Long-term Debt, Maturities, Repayments of Principal in Year Five	73,370
Long-term Debt, Maturities, Repayments of Principal after Year Five	9,778
Long-term Debt	109,222
Deferred financing costs, net	(844)	(795)
Total long-term debt	108,378	$ 126,049
Long-term Debt [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	6,782
Long-term Debt, Maturities, Repayments of Principal in Year Two	4,584
Long-term Debt, Maturities, Repayments of Principal in Year Three	2,761
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,866
Long-term Debt, Maturities, Repayments of Principal in Year Five	72,320
Long-term Debt, Maturities, Repayments of Principal after Year Five	9,764
Long-term Debt	98,077
Deferred financing costs, net	(844)
Total long-term debt	97,233
Capital Lease Obligations [Member]
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	3,340
Long-term Debt, Maturities, Repayments of Principal in Year Two	3,115
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,949
Long-term Debt, Maturities, Repayments of Principal in Year Four	1,677
Long-term Debt, Maturities, Repayments of Principal in Year Five	1,050
Long-term Debt, Maturities, Repayments of Principal after Year Five	14
Long-term Debt	11,145
Deferred financing costs, net	0
Total long-term debt	$ 11,145