Derivative Financial Instruments and Fair Value Measurements (Contingent Consideration) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018
Derivative [Line Items]
Balance, beginning of period		$ (4,286)	$ (11,320)
Fair value adjustments	[1]	0	(2,416)
Balance, end of period		$ (4,286)	$ (8,904)

[1] For the quarter ended March 31, 2018, included an adjustment of $2.5 million to reduce the final contingent consideration obligation payable in 2019 based on the results of Citrusource in fiscal 2018. The parties are in the process of determining the final payment amount under the terms of the Unit Purchase Agreement.