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Significant Accounting Policies (Schedule of Estimated Useful LIves of Intangible Assets) (Details)
 12 Months Ended
Dec. 31, 2020
Trademarks [Member] | Maximum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 20 years
Trademarks [Member] | Minimum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 15 years
Technology / patents [Member] | Maximum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 20 years
Technology / patents [Member] | Minimum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 7 years
Customer relationships [Member] | Maximum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 25 years
Customer relationships [Member] | Minimum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 15 years
Exploration and evaluation assets [Member] | Maximum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 10 years
Exploration and evaluation assets [Member] | Minimum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 8 years
Computer application [Member] | Maximum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 10 years
Computer application [Member] | Minimum [Member]  
Intangible assets [Line Items]  
Estimated Useful Life Amortization in Years 3 years