Derivatives (Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance) (Details) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Apr. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in AOCIL on the effective portion of the Derivative		$ 804	$ 57
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from AOCIL on the effective portion into Income	[1],[2]	(228)	(359)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		606
Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized on the ineffective portion in Income on interest rate swaps		$ 0	$ 0

[1] The amount of gain (loss) reclassified from AOCIL is included in interest expense on the Company's financial statements.

[2] The amount of loss expected to be reclassified from AOCIL into earnings during the next 12 months subsequent to March 31, 2018 is $606.