FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair value disclosure
Carrying value of debt obligations	$ 155,985	$ 71,012
Carrying value
Fair value disclosure
Carrying value of debt obligations	132,756	26,751
Fair value disclosure
Fair value disclosure
Fair value of debt obligations	132,904	26,904
Term Loan
Fair value disclosure
Carrying value of debt obligations	95,000
Term Loan | Carrying value
Fair value disclosure
Carrying value of debt obligations	95,000
Term Loan | Fair value disclosure
Fair value disclosure
Fair value of debt obligations	95,000
Notes payable
Fair value disclosure
Carrying value of debt obligations	37,756	26,751
Notes payable | Carrying value
Fair value disclosure
Carrying value of debt obligations	37,756	26,751
Notes payable | Fair value disclosure
Fair value disclosure
Fair value of debt obligations	$ 37,904	$ 26,904