Shareholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Apr. 01, 2017
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		$ 44,969	$ 36,833
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		0	1,728
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		228	97
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		(282)	(406)
Net change in accumulated other comprehensive income (loss)		23,378	38,477
Other comprehensive income before reclassifications [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other	[1]	46,400	37,581
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		0	1,728
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		0	5
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		11,924	7,290
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		(1,178)	(1,335)
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		0	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		228	97
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		282	401
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]	$ (22,354)	$ 0

[1] Includes intra-entity foreign currency transactions that are of a long-term investment nature of $11,924 and $7,290 for the first quarter of 2018 and 2017, 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 (Note B).