Contingencies Environmental Liability (Details)		12 Months Ended
	Oct. 30, 2009	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Site Contingency [Line Items]
Site Contingency, Number of Potentially Responsible Parties	8
Environmental Remediation Expense		$ 0	$ 0	$ 157,000
Unfavorable Regulatory Action | Cost of Sales
Site Contingency [Line Items]
Environmental Remediation Expense				$ 200,000
Unfavorable Regulatory Action | Other Long-Term Liabilities
Site Contingency [Line Items]
Accrued Environmental Loss Contingencies, Noncurrent		800,000	900,000
Unfavorable Regulatory Action | Other Noncurrent Assets
Site Contingency [Line Items]
Recorded Third-Party Environmental Recoveries, Noncurrent		400,000	$ 500,000
Syracuse China
Site Contingency [Line Items]
Site Contingency, Number of Potentially Responsible Related Parties	1
Motors Liquidation Company | Unfavorable Regulatory Action
Site Contingency [Line Items]
Loss Contingency, Damages Paid, Value		22,000,000
Minimum | Unfavorable Regulatory Action
Site Contingency [Line Items]
Site Contingency, Loss Exposure Not Accrued, Low Estimate		17,000,000
Loss Contingency, Range of Possible Loss, Minimum		0
Maximum | Unfavorable Regulatory Action
Site Contingency [Line Items]
Site Contingency, Loss Exposure Not Accrued, Low Estimate		$ 24,800,000