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EMPLOYEE BENEFIT PLANS - Schedule of Pension Plan Assets Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
United States | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | $ 0 | $ 0
Fair value of plan assets | 18,122 | 17,446
United States | Equity | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 18,122 | 17,446
United States | Equity | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
United States | Equity | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
United States | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 0 | 0
Fair value of plan assets | 18,304 | 17,038
United States | Debt Securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4,273 | 4,766
United States | Debt Securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 14,031 | 12,272
United States | Debt Securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
United States | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 0 | 0
Fair value of plan assets | 1,006 | 1,318
United States | Cash and cash equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,006 | 1,318
United States | Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
United States | Cash and cash equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 4,586 | 3,589
Fair value of plan assets | 319,033 | 277,085
Foreign Plan | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 64,555 | 65,989
Foreign Plan | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 236,769 | 194,511
Foreign Plan | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 13,123 | 12,996
Foreign Plan | Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 4,586 | 3,589
Fair value of plan assets | 138,874 | 120,336
Foreign Plan | Equity | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 38,647 | 38,053
Foreign Plan | Equity | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 95,641 | 78,694
Foreign Plan | Equity | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 0 | 0
Fair value of plan assets | 111,204 | 90,508
Foreign Plan | Debt Securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan | Debt Securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 111,204 | 90,508
Foreign Plan | Debt Securities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 0 | 0
Fair value of plan assets | 2,507 | 4,406
Foreign Plan | Cash and cash equivalents | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,507 | 4,406
Foreign Plan | Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan | Cash and cash equivalents | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan | Insurance Contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
NAV | 0 | 0
Fair value of plan assets | 29,016 | 26,033
Foreign Plan | Insurance Contracts | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Foreign Plan | Insurance Contracts | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 15,893 | 13,037
Foreign Plan | Insurance Contracts | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 13,123 | $ 12,996

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