Acquisitions (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Apr. 06, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Intangible Assets Subject to Amortization:	$ 159,445
LIABILITIES
Goodwill	$ 186,044		$ 21,065	$ 16,803
IP Cleaning S.p.A
ASSETS
Receivables		$ 39,984
Inventories		46,442
Other Current Assets		5,314
Assets Held for Sale		2,247
Property, Plant and Equipment		63,890
Intangible Assets Subject to Amortization:		159,445
Other Assets		8,261
Total Identifiable Assets Acquired		325,583
LIABILITIES
Accounts Payable		32,227
Accrued Expenses		15,611
Deferred Income Taxes		60,433
Other Liabilities		9,360
Total Identifiable Liabilities Assumed		117,631
Net Identifiable Assets Acquired		207,952
Noncontrolling Interest		(2,028)
Goodwill		147,845
Total Estimated Purchase Price, net of Cash Acquired		353,769
Trade Name | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:		26,753
Customer Lists | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:		123,061
Technology | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:		$ 9,631