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Business and summary of significant accounting policies (Schedule of estimated useful lives for each major category of amortizable intangible assets) (Details)
 12 Months Ended
Dec. 31, 2017
Trade Name | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 5 years
Trade Name | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 10 years
Technological Know-How | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 5 years
Technological Know-How | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 9 years
Customer Relationships [Member] | Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 5 years
Customer Relationships [Member] | Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful lives 14 years