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Significant Accounting Policies (Schedule of changes to the consolidated balance sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
CURRENT ASSETS: |  |
Inventories (note 7) | $ 35,274 | $ 14,969
NON-CURRENT ASSETS: |  |
Property, plant and equipment (note 10) | 405,410 | 375,656
Other assets (note 12) | $ 15,210 | 40,744
Previously stated [member] |  |
CURRENT ASSETS: |  |
Inventories (note 7) |  | 14,471
NON-CURRENT ASSETS: |  |
Property, plant and equipment (note 10) |  | 378,509
Other assets (note 12) |  | 38,389
Increase (decrease) due to voluntary changes in accounting policy [member] |  |
CURRENT ASSETS: |  |
Inventories (note 7) |  | 498
NON-CURRENT ASSETS: |  |
Property, plant and equipment (note 10) |  | (2,853)
Other assets (note 12) |  | $ 2,355

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