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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Value |  |
Fair value disclosure |  |
Debt obligations | $ 249,258 | $ 268,441
Fair Value |  |
Fair value disclosure |  |
Debt obligations | 247,522 | 267,131
Level 2 | Credit Facility | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 70,000 | 70,000
Level 2 | Credit Facility | Fair Value |  |
Fair value disclosure |  |
Debt obligations | 70,000 | 70,000
Level 2 | Accounts receivable securitization program | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 45,000 | 45,000
Level 2 | Accounts receivable securitization program | Fair Value |  |
Fair value disclosure |  |
Debt obligations | 45,000 | 45,000
Level 2 | Notes payable | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 134,258 | 153,441
Level 2 | Notes payable | Fair Value |  |
Fair value disclosure |  |
Debt obligations | $ 132,522 | $ 152,131

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