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FAIR VALUE (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Fair Value on a Recurring Basis [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | $ 40,070 | $ 50,307
Other long-term assets | 3,472 | 2,782
Forward contracts | 275 | 1,371
Life insurance contracts | 36,747 | 32,286
Financial assets (liabilities), net | 80,564 | 86,746
Fair Value on a Recurring Basis [Member] | Level 1 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 40,070 | 50,307
Other long-term assets | 3,472 | 2,782
Forward contracts | 0 | 0
Life insurance contracts | 0 | 0
Financial assets (liabilities), net | 43,542 | 53,089
Fair Value on a Recurring Basis [Member] | Level 2 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Other long-term assets | 0 | 0
Forward contracts | 275 | 1,371
Life insurance contracts | 0 | 0
Financial assets (liabilities), net | 275 | 1,371
Fair Value on a Recurring Basis [Member] | Level 3 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 0 | 0
Other long-term assets | 0 | 0
Forward contracts | 0 | 0
Life insurance contracts | 36,747 | 32,286
Financial assets (liabilities), net | 36,747 | $ 32,286
Life Insurance Contracts [Member] |  |
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward] |  |
Beginning balance | 32,286 |
Actual Return on Plan Assets [Abstract] |  |
Relating to assets still held at the reporting date | 3,835 |
Purchases and issuances | 895 |
Sales and settlements | (269) |
Transfers into Level 3 | 0 |
Ending balance | $ 36,747 |

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