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FAIR VALUE MEASUREMENTS (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Quoted Prices in Active Markets (Level 1) |  |
Fair value measurements |  |
Assets measured at fair value | $ 1,927 | $ 1,755
Quoted Prices in Active Markets (Level 1) | Money market funds |  |
Fair value measurements |  |
Assets measured at fair value | 1,927 | 1,755
Significant Other Observable Inputs (Level 2) |  |
Fair value measurements |  |
Assets measured at fair value | 363 | 363
Liabilities measured at fair value | 5,701 | 11,142
Significant Other Observable Inputs (Level 2) | Interest rate derivative |  |
Fair value measurements |  |
Liabilities measured at fair value | 5,701 | 11,142
Significant Other Observable Inputs (Level 2) | Certificate of deposit |  |
Fair value measurements |  |
Assets measured at fair value | 363 | 363
Total |  |
Fair value measurements |  |
Assets measured at fair value | 2,290 | 2,118
Liabilities measured at fair value | 5,701 | 11,142
Total | Interest rate derivative |  |
Fair value measurements |  |
Liabilities measured at fair value | 5,701 | 11,142
Total | Certificate of deposit |  |
Fair value measurements |  |
Assets measured at fair value | 363 | 363
Total | Money market funds |  |
Fair value measurements |  |
Assets measured at fair value | $ 1,927 | $ 1,755

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