Derivative Instruments and Hedging Activities (Effects of the interest rate swap on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jul. 01, 2018	Jun. 25, 2017	Jul. 01, 2018	Jun. 25, 2017
Derivative [Line Items]
Total effects of interest rate swaps on Net income		$ (71,000)	$ (643,000)	$ (379,000)	$ (1,427,000)
Interest rate swap [Member] | Designated as hedging instrument [Member]
Derivative [Line Items]
Total effects of interest rate swaps on Net income		(71,000)	(643,000)	(379,000)	(1,427,000)
Derivative, net hedge ineffectiveness gain (loss)		0	0	0	0
Interest rate swap [Member] | Designated as hedging instrument [Member] | Interest expense [Member]
Derivative [Line Items]
Interest rate swap expense recognized in Interest expense, net	[1]	(95,000)	(1,036,000)	(510,000)	(2,301,000)
Interest rate swap [Member] | Designated as hedging instrument [Member] | Income tax expense [Member]
Derivative [Line Items]
Income tax benefit in Provision for income taxes		$ 24,000	$ 393,000	$ 131,000	$ 874,000

[1] During the thirteen and twenty-six weeks ended July 1, 2018 and June 25, 2017, the Company did not recognize any gain or loss as a result of hedge ineffectiveness.