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Significant Accounting Policies (Schedule of Estimated Useful LIves of Property, Plant and Equipment) (Details)
 12 Months Ended
Dec. 31, 2019
Land roads and buildings [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 30 years
Land roads and buildings [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 15 years
Installations and equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 25 years [1]
Installations and equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 8 years [1]
Dikes and evaporating ponds [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 40 years [2]
Dikes and evaporating ponds [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 20 years [2]
Heavy mechanical equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 15 years
Heavy mechanical equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 5 years
Furniture, vehicles and equipment [Member] | Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 10 years
Furniture, vehicles and equipment [Member] | Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Estimated Useful Life Depreciation in Years 3 years
[1] Mainly 25 years.
[2] Mainly 40 years.