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Supplemental Financial Information - Prepaid expenses and other assets and Other assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid expenses and other assets: |  |
Prepaid expenses | $ 2,370 | $ 1,690
Prepaid income taxes and income tax refunds | 1,038 | 1,605
Other | 1,206 | 1,302
Other current assets | 4,614 | 4,597
Other long-term assets, net: |  |
Cabot receivable | 6,812 | 8,852
Upfront Customer Consideration | 7,109 | 7,490
Mine development costs, net | 5,291 | 4,338
Right of use assets, operating leases, net | 6,399 | 1,930
Spare parts, net | 4,316 | 3,727
Mine reclamation asset, net | 1,644 | 1,712
Highview Investment | 552 | 552
Other | 1,278 | 1,388
Total | $ 33,401 | $ 29,989

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