Derivative Financial Instruments, Notional Amounts and Fair Values of Foreign Currency Forward Contracts Designated as Cash Flow Hedging Instruments (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017	Jul. 02, 2017
Foreign Exchange Forward [Member]
Derivative [Line Items]
Notional amount of derivative	$ 1,141,067	$ 1,376,877	$ 1,870,058
Fair value of hedged item	16,964	(7,934)	5,943
Inventory Purchases [Member]
Derivative [Line Items]
Notional amount of derivative	647,255	756,673	942,896
Fair value of hedged item	10,248	(13,695)	259
Sales [Member]
Derivative [Line Items]
Notional amount of derivative	342,123	423,315	618,755
Fair value of hedged item	11,291	16,144	15,229
Royalties and Other [Member]
Derivative [Line Items]
Notional amount of derivative	151,689	196,889	308,407
Fair value of hedged item	$ (4,575)	$ (10,383)	$ (9,545)