Acquisition (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Apr. 06, 2017
LIABILITIES
Goodwill	$ 185,715	$ 186,044
IP Cleaning S.p.A
ASSETS
Receivables			$ 39,984
Inventories			46,442
Other Current Assets			7,456
Assets Held for Sale			2,247
Property, Plant and Equipment			63,890
Intangible Assets Subject to Amortization:			159,445
Other Assets			2,000
Total Identifiable Assets Acquired			321,464
LIABILITIES
Accounts Payable			32,227
Accrued Expenses			18,130
Deferred Income Taxes			56,950
Other Liabilities			10,964
Total Identifiable Liabilities Assumed			118,271
Net Identifiable Assets Acquired			203,193
Noncontrolling Interest			(1,896)
Goodwill			152,472
Total Purchase Price, net of Cash Acquired			353,769
Trade Names | 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