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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Value |  |
Fair value disclosure |  |
Debt obligations | $ 291,409 | $ 268,441
Fair Value |  |
Fair value disclosure |  |
Debt obligations | 291,560 | 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 borrowings | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 40,000 | 45,000
Level 2 | Accounts receivable securitization borrowings | Fair Value |  |
Fair value disclosure |  |
Debt obligations | 40,000 | 45,000
Level 2 | Notes payable | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 181,409 | 153,441
Level 2 | Notes payable | Fair Value |  |
Fair value disclosure |  |
Debt obligations | $ 181,560 | $ 152,131

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