FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair value disclosure
Carrying value of debt obligations	$ 133,976	$ 155,985
Carrying value
Fair value disclosure
Carrying value of debt obligations	120,142	132,756
Fair value disclosure
Fair value disclosure
Fair value of debt obligations	120,195	132,904
Term Loan
Fair value disclosure
Carrying value of debt obligations	90,000	95,000
Term Loan | Carrying value
Fair value disclosure
Carrying value of debt obligations	90,000	95,000
Term Loan | Fair value disclosure
Fair value disclosure
Fair value of debt obligations	90,000	95,000
Notes payable
Fair value disclosure
Carrying value of debt obligations	30,142	37,756
Notes payable | Carrying value
Fair value disclosure
Carrying value of debt obligations	30,142	37,756
Notes payable | Fair value disclosure
Fair value disclosure
Fair value of debt obligations	$ 30,195	$ 37,904