FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Carrying Value
Fair value disclosure
Debt obligations	$ 190,758	$ 126,759
Fair Value
Fair value disclosure
Debt obligations	190,822	126,743
Credit Facility | Carrying Value
Fair value disclosure
Debt obligations	70,000
Credit Facility | Fair Value
Fair value disclosure
Debt obligations	70,000
Term Loan | Carrying Value
Fair value disclosure
Debt obligations		70,000
Term Loan | Fair Value
Fair value disclosure
Debt obligations		70,000
Accounts receivable securitization program | Carrying Value
Fair value disclosure
Debt obligations	35,000
Accounts receivable securitization program | Fair Value
Fair value disclosure
Debt obligations	35,000
Notes payable | Carrying Value
Fair value disclosure
Debt obligations	85,758	56,759
Notes payable | Fair Value
Fair value disclosure
Debt obligations	$ 85,822	$ 56,743