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Commitments and Contingencies (Narrative) (Details) RUB in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2016 RUB
Product Liability Contingency [Line Items] |  |  |  |  |  |
Estimated repair costs | $ 5,200,000 |  |  |  |  |
Expense for asbestos-related litigation |  | $ 2,400,000 | $ 1,900,000 |  |  |
Russia [Member] |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |
Annual sales |  |  |  | $ 4,000,000 |  |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |
Alleged unauthorized payment |  |  |  |  | $ 475 | RUB 30
Value of shipment |  |  |  |  | $ 68,500 | RUB 62
Minimum [Member] |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |
Probable outstanding liability for quality issue, higher range |  | 900,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |
Probable outstanding liability for quality issue, higher range |  | $ 9,100,000 |  |  |  |

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