FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value disclosure
Carrying value of debt obligations	$ 145,030	$ 155,985
Carrying value
Fair value disclosure
Carrying value of debt obligations	126,580	132,756
Fair value disclosure
Fair value disclosure
Fair value of debt obligations	126,542	132,904
Term Loan
Fair value disclosure
Carrying value of debt obligations	92,500	95,000
Term Loan | Carrying value
Fair value disclosure
Carrying value of debt obligations	92,500	95,000
Term Loan | Fair value disclosure
Fair value disclosure
Fair value of debt obligations	92,500	95,000
Notes payable
Fair value disclosure
Carrying value of debt obligations	34,080	37,756
Notes payable | Carrying value
Fair value disclosure
Carrying value of debt obligations	34,080	37,756
Notes payable | Fair value disclosure
Fair value disclosure
Fair value of debt obligations	$ 34,042	$ 37,904