Business Acquisitions - Table (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Finite-Lived Customer Lists, Gross	$ 68,463	$ 67,435
Finite-Lived Trademarks, Gross	23,823	23,147
Other Finite-Lived Intangible Assets, Gross	5,986	5,788
Goodwill	79,324	$ 79,111
Verkol [Member]
Business Acquisition [Line Items]
Current Assets (includes cash acquired)	31,151
Property, Plant & Equipment	7,941
Finite-Lived Customer Lists, Gross	6,146
Finite-Lived Trademarks, Gross	5,378
Other Finite-Lived Intangible Assets, Gross	219
Goodwill	5,051
Other Long-term Assets	158
Total Assets Purchased	56,044
Current Liabilities	(6,720)
Long-Term Debt	(2,400)
Other Long-Term Liabilities	(5,531)
Total Liabilities Assumed	(14,651)
Business Acquisition, Cost of Acquired Entity, Purchase Price, Gross	41,393
Cash Acquired	15,423
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 25,970