Commitments and Contingencies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)	Oct. 31, 2016 RUB
Product Liability Contingency [Line Items]
Expense for asbestos-related litigation	$ 1,700,000	$ 800,000
Russia
Product Liability Contingency [Line Items]
Annual sales			$ 4,000,000
Unfavorable Regulatory Action [Member]
Product Liability Contingency [Line Items]
Alleged unauthorized payment				$ 475	RUB 30,000
Value of shipment				$ 68,500	RUB 62,000
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