Commitments and Contingencies (Textuals) (Details) ft² in Thousands		12 Months Ended
	Mar. 22, 2013 USD ($) ft²	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 RUB (₽)
Loss Contingencies [Line Items]
Probable liability accrued		$ 9,700,000
Accrued asbestos reserves		9,700,000	$ 8,500,000
Number of years of lease of corporate headquarters	6 years
Area of leased office building (in square feet) | ft²	192
Purchase price of property at end of lease term	$ 41,200,000.0
Percentage of lease balance as final payment end of lease term	86.00%
Debt covenant, debt not paid when due	$ 75,000,000
Expense for known and future asbestos-related litigation		4,000,000	$ 3,500,000	$ 6,300,000
Maximum [Member]
Loss Contingencies [Line Items]
Accrued asbestos reserves		34,600,000
Minimum [Member]
Loss Contingencies [Line Items]
Accrued asbestos reserves		19,300,000
Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Alleged payment					$ 475
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Accrued asbestos reserves		$ 19,300,000
Russia, Rubles | Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Alleged payment | ₽						₽ 30,000