Shareholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other		$ 54,951	$ 16,336	$ 225,431	$ 38,005
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		1,357	1,273	4,639	(2,408)
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		(2,093)	94	(2,543)	278
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(492)	(814)	(1,403)	(5,578)
Net change in accumulated other comprehensive income (loss)		53,503	18,049	224,539	40,195
Other comprehensive income before reclassifications [Member]
Changes In Components Of OCI [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment and Other	[1]	57,988	15,822	227,928	35,610
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		1,357	1,273	4,639	(2,408)
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		(2,223)	0	(2,870)	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(51)	25	(94)	97
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		(11,193)	(9,273)	(50,512)	(38,092)
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		(4,241)	46	(6,888)	1,137
Other Comprehensive Income (Loss) Unrealized gain (loss) on investment securities, net		0	0	0	0
Other Comprehensive Income, Unrealized Gain on Derivatives Arising During Period, Net		130	94	327	278
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		$ 543	$ 789	$ 1,497	$ 5,481

[1] Includes intra-entity foreign currency transactions that are of a long-term investment nature of $(11,193) and $(50,512) for the third quarter and first nine months of 2017 and $(9,273) and $(38,092) for the third quarter and first nine months of 2016, respectively.