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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Carrying Value |  |
Fair value disclosure |  |
Debt obligations | $ 224,723 | $ 211,703
Fair Value |  |
Fair value disclosure |  |
Debt obligations | 224,822 | 211,495
Credit Facility | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 70,000 | 70,000
Credit Facility | Fair Value |  |
Fair value disclosure |  |
Debt obligations | 70,000 | 70,000
Accounts receivable securitization program | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 35,000 | 35,000
Accounts receivable securitization program | Fair Value |  |
Fair value disclosure |  |
Debt obligations | 35,000 | 35,000
Notes payable | Carrying Value |  |
Fair value disclosure |  |
Debt obligations | 119,723 | 106,703
Notes payable | Fair Value |  |
Fair value disclosure |  |
Debt obligations | $ 119,822 | $ 106,495

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