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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.

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