Derivative Instruments and Hedging Activities (Fair value and classification of interest rate swaps) (Details) - USD ($) $ in Thousands		Jul. 01, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, interest rate swaps, assets, fair value	[1]	$ 1,162	$ 67
Interest rate swap [Member] | Designated as hedging instrument [Member] | Other current assets, net [Member]
Derivative [Line Items]
Derivative, interest rate swaps, assets, fair value		1,162	0
Interest rate swap [Member] | Designated as hedging instrument [Member] | Other assets, net [Member]
Derivative [Line Items]
Derivative, interest rate swaps, assets, fair value		0	67
Interest rate swap [Member] | Designated as hedging instrument [Member] | Accrued and other current liabilities [Member]
Derivative [Line Items]
Derivative, interest rate swaps, liabilities, fair value	[1]	$ 0	$ 1,010

[1] See Note 11 - Fair Value Measurements for fair value discussion of the interest rate swaps.