Acquisitions - Codenhove Acquisition Narrative (Details) - USD ($)		3 Months Ended								12 Months Ended
	Nov. 01, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Acquisition/integration/restructuring costs										$ 1,300,000	$ 7,000,000	$ 6,500,000
Net sales		$ 244,000,000	$ 245,100,000	$ 248,700,000	$ 242,100,000	$ 220,500,000	$ 232,900,000	$ 246,000,000	$ 242,100,000	979,900,000	$ 941,500,000	$ 887,700,000
W.A. Sanders Coldenhove Holding B.V.
Business Acquisition [Line Items]
Business acquisition, purchase price	$ 45,000,000
Payment for debt extinguishment	3,000,000
Payments to acquire business, cash on hand at date of transaction	17,000,000
Goodwill expected to be deductible for income tax purpose	0
Acquisition/integration/restructuring costs										1,300,000
Net sales										$ 7,500,000
Global Revolving Credit Facilities (variable rates) due December 2019
Business Acquisition [Line Items]
Borrowings on line of credit	$ 31,000,000