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FAIR VALUE (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Fair Value on a Recurring Basis [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | $ 38,282 | $ 36,531
Other long-term assets | 3,582 | 3,726
Forward contracts | 0 | 158
Life insurance contracts | 39,248 | 37,737
Financial assets (liabilities), net | 81,112 | 78,152
Fair Value on a Recurring Basis [Member] | Level 1 [Member] |  |
Financial Assets (Liabilities) [Abstract] |  |
Cash equivalents and current investments | 38,282 | 36,531
Other long-term assets | 3,582 | 3,726
Forward contracts | 0 | 0
Life insurance contracts | 0 | 0
Financial assets (liabilities), net | 41,864 | 40,257
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 | 0 | 158
Life insurance contracts | 0 | 0
Financial assets (liabilities), net | 0 | 158
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 | 39,248 | 37,737
Financial assets (liabilities), net | 39,248 | $ 37,737
Life Insurance Contracts [Member] |  |
Changes in Fair Value of Level 3 Marketable Securities [Roll Forward] |  |
Beginning balance | 37,737 |
Actual return on plan assets | 1,746 |
Purchases and issuances | 0 |
Sales and settlements | (235) |
Transfers into Level 3 | 0 |
Ending balance | $ 39,248 |

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