Financial Instruments Measured at Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		$ (1,427)	$ 0	$ 4,106	$ 0
Document Period End Date				Jun. 29, 2019
Unrealized Gain on Securities		8		$ 1,842
Unrealized Loss on Securities			$ (4,633)		$ (7,288)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		22,120		22,120		$ 22,883
Equity investments		42,637		42,637		38,045
Interest rate swaps- liability		(9,168)		(9,168)		(589)
Foreign exchange contracts - asset		13,122		13,122		4,163
Foreign exchange contracts - liability		(2,950)		(2,950)		(2,384)
Total Fair Value Assets And Liabilities Measured On Recurring Basis		65,761		65,761		62,118
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	22,120		22,120		22,883
Equity investments	[2]	42,637		42,637		38,045
Interest rate swaps- liability		0		0		0
Foreign exchange contracts - asset		0		0		0
Foreign exchange contracts - liability		0		0		0
Total Fair Value Assets And Liabilities Measured On Recurring Basis		64,757		64,757		60,928
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0		0		0
Equity investments		0		0		0
Interest rate swaps- liability		(9,168)		(9,168)		(589)
Foreign exchange contracts - asset		13,122		13,122		4,163
Foreign exchange contracts - liability		(2,950)		(2,950)		(2,384)
Total Fair Value Assets And Liabilities Measured On Recurring Basis		1,004		1,004		1,190
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0		0		0
Equity investments		0		0		0
Interest rate swaps- liability		0		0		0
Foreign exchange contracts - asset		0		0		0
Foreign exchange contracts - liability		0		0		0
Total Fair Value Assets And Liabilities Measured On Recurring Basis		$ 0		$ 0		$ 0
Marubun [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment Ownership Percentage		8.40%		8.40%
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease)		$ 224		$ 6,816

[1] Cash equivalents include highly liquid investments with an original maturity of less than three months.

[2] The company has an 8.4% equity ownership interest in Marubun Corporation and a portfolio of mutual funds with quoted market prices. The company recorded an unrealized gain of $8 and $1,842 for the second quarter and six months ended June 29, 2019, respectively, on equity securities held at the end of the quarter. The company recorded an unrealized loss of $4,633 and $7,288 for the second quarter and six months ended June 30, 2018, respectively, on equity securities held at the end of the quarter.