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Significant Accounting Policies (Schedule of changes to the cash flow) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Inventories | $ (25,659) | $ (3,889)
Net cash provided by operating activities | 93,385 | 60,152
INVESTING ACTIVITIES |  |
Expenditures on Lindero construction | (80,782) | (186,800)
Cash used in investing activities | $ (113,649) | (142,361)
Previously stated [member] |  |
Inventories |  | (1,036)
Net cash provided by operating activities |  | 63,005
INVESTING ACTIVITIES |  |
Expenditures on Lindero construction |  | (189,653)
Cash used in investing activities |  | (145,214)
Increase (decrease) due to voluntary changes in accounting policy [member] |  |
Inventories |  | (2,853)
Net cash provided by operating activities |  | (2,853)
INVESTING ACTIVITIES |  |
Expenditures on Lindero construction |  | 2,853
Cash used in investing activities |  | $ 2,853

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