Shareholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		$ 4,442	$ 44,969
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		5,533	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		240	228
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		(319)	(282)
Cumulative Effect on Retained Earnings, Net of Tax			0
Net change in Accumulated other comprehensive income (loss)		11,182	23,378
Other comprehensive income before reclassifications [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other	[1]	5,276	46,400
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		6,592	0
Other comprehensive income before reclassifications [Member] | Intra-entity foreign currency transactions [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		9,859	(11,924)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		(186)	(1,178)
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		(1,059)	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		240	228
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		319	282
Cumulative impact of newly adopted accounting standard updates [Member]
Changes In Components Of OCI [Line Items]
Cumulative Effect on Retained Earnings, Net of Tax	[2]	$ 0	$ (22,354)

[1] Includes intra-entity foreign currency transactions that are of a long-term investment nature of $9,859 and $(11,924) for the first quarter of 2019 and 2018, respectively.

[2] Amounts relate to unrealized gains and losses on investments and stranded tax effects reclassified from "Accumulated other comprehensive income" to "Retained earnings" in accordance with ASU No. 2018-02 and ASU No. 2016-01.