Long-Term Debt and Credit Arrangements (Revolving Credit Facility) (Details) - Amended Revolving Credit Facility [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) Rate	Dec. 30, 2017 Rate
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity | $	$ 150,000
Basis Spread on Variable Rate at End of Period	1.75%
Commitment Fee Percentage	0.375%
Debt, Weighted Average Interest Rate	4.41%	4.12%
Current Borrowing Capacity Accessible to the Company | $	$ 10,280
Line of Credit Facility, Amended Minimum Borrowing Capacity for No Financial Covenants | $	16,500
Remaining Borrowing Capacity | $	$ 26,780
Minimum [Member]
Line of Credit Facility [Line Items]
Fixed Charge Coverage Ratio	1.1
Alternative [Member] | Minimum [Member] | Libor [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.50%
Alternative [Member] | Maximum [Member] | Libor [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	2.00%
Alternative B [Member] | Federal Funds [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	0.50%
Alternative B [Member] | Daily Libor [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.00%
Alternative B [Member] | Minimum [Member] | Daily Libor [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	0.50%
Alternative B [Member] | Maximum [Member] | Daily Libor [Member]
Line of Credit Facility [Line Items]
Basis Spread on Variable Rate	1.00%