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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