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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Value |  |
Fair value disclosure |  |
Debt obligations | $ 256,741 | $ 243,032
Fair Value |  |
Fair value disclosure |  |
Debt obligations | 256,405 | 242,503
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 | 35,000
Level 2 | Accounts receivable securitization program | Fair Value |  |
Fair value disclosure |  |
Debt obligations | 45,000 | 35,000
Level 2 | Notes payable | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 141,741 | 138,032
Level 2 | Notes payable | Fair Value |  |
Fair value disclosure |  |
Debt obligations | $ 141,405 | $ 137,503

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