Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets Gross [Abstract]
Finite Lived Customer Lists, Gross	$ 76,581	$ 71,454
Trademarks, Formulations And Product Technology	33,025	31,436
Other Finite Lived Intangible Assets, Gross	6,114	6,023
Total	115,720	108,913
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	45,217	36,942
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	25,394	20,043
Trademarks Formulations And Product Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	14,309	11,748
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Accumulated Amortization	$ 5,514	$ 5,151