Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2010
Future Claims Period	15 years
Pretax Charge, Asbestos-Related	$ 1,600,000	$ 1,600,000	$ 4,100,000
Liability for Asbestos and Environmental Claims, Gross, Incurred Loss	8,300,000	8,000,000	20,200,000
Asbestos Insurance Asset Increase	6,700,000	6,400,000	16,100,000
Operating Leases, Rent Expense, Net	38,500,000	$ 34,800,000	$ 35,600,000
Purchase Obligation	$ 271,800,000
Subsidiary 1 [Member]
Indemnification Period				20 years
Future Expected Recovery Percentage	91.80%
Future Expected Asbestos Cost Percentage	8.20%
Liability for Asbestos and Environmental Claims, Gross, Payment for Claims	$ 142.8
Asbestos-Related Insurance Proceeds	60,100,000
Funding Requirement Amount	10,000,000
Requested Insurer Reimburse [Member]
Liability for Asbestos and Environmental Claims, Gross, Payment for Claims	$ 94,900,000
Subsidiary 2 [Member]
Future Expected Asbestos Cost Percentage	21.60%