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Income and Mining Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Mineral properties | $ 25,691 | $ 118,852
Inventory | 847 | 4,513
Foreign subsidiaries - unremitted earnings | 50 | 7
Gross deferred tax liabilities | 26,588 | 123,372
Deferred tax assets: |  |
Net operating loss carryforwards | 219,192 | 189,840
Property, plant, and equipment | 20,212 | 7,779
Mining Royalty Tax | 6,764 | 8,980
Capital loss carryforwards | 21,956 | 23,003
Asset retirement obligation | 34,134 | 27,980
Unrealized foreign currency loss and other | 9,133 | 8,387
Royalty and other long-term debt | 6,235 | 3,821
Accrued expenses | 8,899 | 14,247
Tax credit carryforwards | 29,881 | 33,897
Gross deferred tax assets | 356,406 | 317,934
Valuation allowance | (371,277) | (272,839)
Deferred tax assets, net of valuation allowance | (14,871) | 45,095
Net deferred tax liabilities | $ 41,459 | $ 78,277

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