Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Gross [Abstract]
Customer Lists And Rights To Sell	$ 75,844	$ 71,454
Trademarks, Formulations And Product Technology	32,618	31,436
Other Finite-Lived Intangible Assets, Gross	6,090	6,023
Total	114,552	108,913
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	41,246	36,942
Customer Lists And Rights To Sell
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	22,764	20,043
Formulations And Product Technology [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	13,143	11,748
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 5,339	$ 5,151