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Commitments and Contingencies (Narrative) (Details)
RUB in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Oct. 31, 2016
USD ($)
Oct. 31, 2016
RUB
Product Liability Contingency [Line Items]          
Estimated repair costs $ 500,000 $ 5,700,000      
Expense for asbestos-related litigation   $ 3,900,000 $ 2,300,000    
Unfavorable Regulatory Action [Member]          
Product Liability Contingency [Line Items]          
Alleged unauthorized payment       $ 475 RUB 30