Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets Gross [Abstract]
Finite Lived Customer Lists, Gross	$ 74,989	$ 76,581
Trademarks, Formulations And Product Technology	33,275	33,025
Other Finite Lived Intangible Assets, Gross	5,840	6,114
Total	114,104	115,720
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	51,622	45,217
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	29,587	25,394
Trademarks Formulations And Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	16,469	14,309
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	$ 5,566	$ 5,514