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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Value |  |
Fair value measurements |  |
Long-term debt | $ 152,400 | $ 156,800
Significant Other Observable Inputs (Level 2) | Estimated Fair Value |  |
Fair value measurements |  |
Long-term debt | 155,600 | 159,900
Significant Other Observable Inputs (Level 2) | Estimated Fair Value | Other Assets |  |
Fair value measurements |  |
Marketable securities | 2,000 |
Recurring basis |  |
Fair value measurements |  |
Total assets measured at fair value | 78,925 | 68,636
Recurring basis | Certificate of deposit |  |
Fair value measurements |  |
Certificates of deposit | 391 | 391
Recurring basis | Money market funds |  |
Fair value measurements |  |
Short-term investments | 19,785 | 29,027
Recurring basis | Short Term Investments |  |
Fair value measurements |  |
Short-term investments | 8,711 | 9,237
Recurring basis | Commercial Paper |  |
Fair value measurements |  |
Short-term investments | 50,038 | 29,981
Recurring basis | Quoted Prices in Active Markets (Level 1) |  |
Fair value measurements |  |
Total assets measured at fair value | 21,044 | 30,778
Recurring basis | Quoted Prices in Active Markets (Level 1) | Money market funds |  |
Fair value measurements |  |
Short-term investments | 19,785 | 29,027
Recurring basis | Quoted Prices in Active Markets (Level 1) | Short Term Investments |  |
Fair value measurements |  |
Short-term investments | 1,259 | 1,751
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Fair value measurements |  |
Total assets measured at fair value | 57,881 | 37,858
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificate of deposit |  |
Fair value measurements |  |
Certificates of deposit | 391 | 391
Recurring basis | Significant Other Observable Inputs (Level 2) | Short Term Investments |  |
Fair value measurements |  |
Short-term investments | 7,452 | 7,486
Recurring basis | Significant Other Observable Inputs (Level 2) | Commercial Paper |  |
Fair value measurements |  |
Short-term investments | $ 50,038 | $ 29,981

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