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Financial Instruments Measured at Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 30, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unrealized Gain on Securities |  | $ 1,824 |
Unrealized Loss on Securities |  | 2,579 |
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash Equivalents |  | 21,738 | $ 22,883
Equity investments |  | 42,753 | 38,045
Interest rate swaps- liability |  | (557) | (589)
Foreign exchange contracts - asset |  | 12,925 | 4,163
Foreign exchange contracts - liability |  | (998) | (2,384)
Total Fair Value Assets And Liabilities Measured On Recurring Basis |  | 75,861 | 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] | 21,738 | 22,883
Equity investments | [2] | 42,753 | 38,045
Interest rate swaps- liability |  | 0 | 0
Foreign exchange contracts - asset |  | 0 | 0
Foreign exchange contracts - liability |  | 0 | 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis |  | 64,491 | 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
Equity investments |  | 0 | 0
Interest rate swaps- liability |  | (557) | (589)
Foreign exchange contracts - asset |  | 12,925 | 4,163
Foreign exchange contracts - liability |  | (998) | (2,384)
Total Fair Value Assets And Liabilities Measured On Recurring Basis |  | 11,370 | 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
Equity investments |  | 0 | 0
Interest rate swaps- liability |  | 0 | 0
Foreign exchange contracts - asset |  | 0 | 0
Foreign exchange contracts - liability |  | 0 | 0
Total Fair Value Assets And Liabilities Measured On Recurring Basis |  | $ 0 | $ 0
Marubun [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment Ownership Percentage |  | 8.40% |
[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 $1,824 and an unrealized loss of $2,579 for the first quarter of 2019 and 2018, respectively, on equity securities held at the end of each quarter.

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