Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Gross [Abstract]
Customer Lists And Rights To Sell	$ 75,351	$ 76,581
Trademarks, Formulations And Product Technology	33,538	33,025
Other Finite-Lived Intangible Assets, Gross	5,990	6,114
Total	114,879	115,720
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	48,329	45,217
Customer Lists And Rights To Sell
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	27,414	25,394
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	15,359	14,309
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 5,556	$ 5,514