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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair value measurements |  |  |  |  |
Purchase of other investments |  |  | $ 10,285 | $ 3,000 |
Other Assets |  |  |  |  |
Fair value measurements |  |  |  |  |
Acquired additional securities |  |  | 200 |  |
Loss on equity securities |  |  | 2,100 |  |
Carrying Value |  |  |  |  |
Fair value measurements |  |  |  |  |
Long-term debt |  | $ 88,300 | 88,300 |  | $ 91,000
Carrying Value | Other Assets |  |  |  |  |
Fair value measurements |  |  |  |  |
Strategic investments |  | 21,200 | 21,200 |  | 23,100
Short Term Investments and Commercial Paper |  |  |  |  |
Fair value measurements |  |  |  |  |
Equity investments |  | 200 | 200 |  | 200
Other investments |  |  |  |  |
Fair value measurements |  |  |  |  |
Purchase of other investments |  |  | 10,000 |  |
Other investments | Renewable energy partnership |  |  |  |  |
Fair value measurements |  |  |  |  |
Investment cost |  | 14,400 | 14,400 |  |
Purchase of other investments | $ 14,100 | 300 |  |  |
Investment Tax Credit |  | 12,000 |  |  |
Equity investments |  | 2,400 | 2,400 |  |
Interest rate swap | Other Assets |  |  |  |  |
Fair value measurements |  |  |  |  |
Unrealized loss |  |  | 200 |  |
Level 2 | Estimated Fair Value |  |  |  |  |
Fair value measurements |  |  |  |  |
Long-term debt |  | 88,800 | 88,800 |  | 91,600
Level 3 |  |  |  |  |
Fair value measurements |  |  |  |  |
Payments to acquire investments |  |  | 12,400 |  |
Unrealized loss |  |  | 0 |  |
Recurring basis |  |  |  |  |
Fair value measurements |  |  |  |  |
Total assets and liabilities measured at fair value |  | 18,094 | 18,094 |  | 17,151
Recurring basis | Certificate of deposit |  |  |  |  |
Fair value measurements |  |  |  |  |
Cash and cash equivalents |  | 3,380 | 3,380 |  | 380
Recurring basis | Money market funds |  |  |  |  |
Fair value measurements |  |  |  |  |
Cash and cash equivalents |  | 2,151 | 2,151 |  | 2,266
Recurring basis | Short Term Investments |  |  |  |  |
Fair value measurements |  |  |  |  |
Investments |  | 250 | 250 |  | 393
Recurring basis | Commercial paper |  |  |  |  |
Fair value measurements |  |  |  |  |
Investments |  |  |  |  | 13,972
Recurring basis | Other investments |  |  |  |  |
Fair value measurements |  |  |  |  |
Investments |  | 12,394 | 12,394 |  |
Recurring basis | Interest rate swap |  |  |  |  |
Fair value measurements |  |  |  |  |
Derivative assets |  |  |  |  | 140
Derivative liabilities |  | (81) | (81) |  |
Recurring basis | Level 1 |  |  |  |  |
Fair value measurements |  |  |  |  |
Total assets and liabilities measured at fair value |  | 2,401 | 2,401 |  | 2,659
Recurring basis | Level 1 | Money market funds |  |  |  |  |
Fair value measurements |  |  |  |  |
Cash and cash equivalents |  | 2,151 | 2,151 |  | 2,266
Recurring basis | Level 1 | Short Term Investments |  |  |  |  |
Fair value measurements |  |  |  |  |
Investments |  | 250 | 250 |  | 393
Recurring basis | Level 2 |  |  |  |  |
Fair value measurements |  |  |  |  |
Total assets and liabilities measured at fair value |  | 3,299 | 3,299 |  | 14,492
Recurring basis | Level 2 | Certificate of deposit |  |  |  |  |
Fair value measurements |  |  |  |  |
Cash and cash equivalents |  | 3,380 | 3,380 |  | 380
Recurring basis | Level 2 | Commercial paper |  |  |  |  |
Fair value measurements |  |  |  |  |
Investments |  |  |  |  | 13,972
Recurring basis | Level 2 | Interest rate swap |  |  |  |  |
Fair value measurements |  |  |  |  |
Derivative assets |  |  |  |  | $ 140
Derivative liabilities |  | (81) | (81) |  |
Recurring basis | Level 3 |  |  |  |  |
Fair value measurements |  |  |  |  |
Total assets and liabilities measured at fair value |  | 12,394 | 12,394 |  |
Recurring basis | Level 3 | Other investments |  |  |  |  |
Fair value measurements |  |  |  |  |
Investments |  | $ 12,394 | $ 12,394 |  |

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