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Supplemental Financial Information - Other Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Other current liabilities:    
Current portion of operating lease obligations $ 2,142 $ 2,382
Accrued interest 298 213
Income and other taxes payable 805 678
Other 1,030 1,038
Other current liabilities 4,275 4,311
Other long-term liabilities:    
Operating lease obligations, long-term 2,415 2,810
Mine reclamation liability 2,752 2,721
Other 71 229
Other long-term liabilities $ 5,238 $ 5,760