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FAIR VALUE MEASUREMENTS AND INVESTMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019
Fair value measurements |  |  |  |
Acquired additional securities | $ 2,768 |  | $ 10,000 |
Increase in carrying value | $ (1,775) |  |  |
Privately Held Investment |  |  |  |
Fair value measurements |  |  |  |
Ownership percentage | 24.00% |  |  |
Additional investment | $ 2,800 |  |  |
Increase in carrying value | 300 |  |  |
Share investee loss | 300 |  |  |
Currency losses | 2,200 |  |  |
Other assets | Privately Held Investment |  |  |  |
Fair value measurements |  |  |  |
Carrying value | 15,800 |  |  |
Carrying Value |  |  |  |
Fair value measurements |  |  |  |
Long-term debt | 85,500 |  |  | $ 86,400
Carrying Value | Other assets |  |  |  |
Fair value measurements |  |  |  |
Strategic investments | 2,100 |  |  | 2,100
Short Term Investments |  |  |  |
Fair value measurements |  |  |  |
Equity investments | 100 |  |  | 200
Loss (gain) on equity securities | 100 |  | $ 0 |
Other investments |  |  |  |
Fair value measurements |  |  |  |
Equity investments | 10,500 |  |  |
Increase in carrying value | 300 |  |  |
Other investments | Renewable energy partnership |  |  |  |
Fair value measurements |  |  |  |
Investment cost |  | $ 14,400 |  |
Investment Tax Credit |  | $ 12,000 |  |
Equity investments | 2,500 |  |  | 2,500
Level 2 | Estimated Fair Value |  |  |  |
Fair value measurements |  |  |  |
Long-term debt | 86,000 |  |  | 86,900
Level 2 | Interest rate swap |  |  |  |
Fair value measurements |  |  |  |
Unrealized loss | 200 |  |  |
Recurring basis |  |  |  |
Fair value measurements |  |  |  |
Total assets and liabilities measured at fair value | 15,276 |  |  | 15,769
Recurring basis | Certificate of deposit |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 380 |  |  | 380
Recurring basis | Money market funds |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 2,028 |  |  | 2,329
Recurring basis | Short Term Investments |  |  |  |
Fair value measurements |  |  |  |
Investments | 104 |  |  | 416
Recurring basis | Other investments |  |  |  |
Fair value measurements |  |  |  |
Investments | 12,996 |  |  | 12,700
Recurring basis | Interest rate swap |  |  |  |
Fair value measurements |  |  |  |
Derivative liabilities | (232) |  |  | (56)
Recurring basis | Level 1 |  |  |  |
Fair value measurements |  |  |  |
Total assets and liabilities measured at fair value | 2,132 |  |  | 2,745
Recurring basis | Level 1 | Money market funds |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 2,028 |  |  | 2,329
Recurring basis | Level 1 | Short Term Investments |  |  |  |
Fair value measurements |  |  |  |
Investments | 104 |  |  | 416
Recurring basis | Level 2 |  |  |  |
Fair value measurements |  |  |  |
Total assets and liabilities measured at fair value | 148 |  |  | 324
Recurring basis | Level 2 | Certificate of deposit |  |  |  |
Fair value measurements |  |  |  |
Cash and cash equivalents | 380 |  |  | 380
Recurring basis | Level 2 | Interest rate swap |  |  |  |
Fair value measurements |  |  |  |
Derivative liabilities | (232) |  |  | (56)
Recurring basis | Level 3 |  |  |  |
Fair value measurements |  |  |  |
Total assets and liabilities measured at fair value | 12,996 |  |  | 12,700
Recurring basis | Level 3 | Other investments |  |  |  |
Fair value measurements |  |  |  |
Investments | $ 12,996 |  |  | $ 12,700

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