Acquisitions (Details 2) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Apr. 06, 2017	Dec. 31, 2016
LIABILITIES
Goodwill	$ 182,671,000	$ 186,044,000		$ 21,065,000
IP Cleaning S.p.A
ASSETS
Receivables			$ 39,984,000
Inventories			46,442,000
Other Current Assets			7,456,000
Assets Held for Sale			2,247,000
Property, Plant and Equipment			63,890,000
Intangible Assets Subject to Amortization:	$ 4,627,000
Other Assets			2,000,000
Total Identifiable Assets Acquired			321,464,000
LIABILITIES
Accounts Payable			32,227,000
Accrued Expenses			18,130,000
Deferred Income Taxes			56,950,000
Other Liabilities			10,964,000
Total Identifiable Liabilities Assumed			118,271,000
Net Identifiable Assets Acquired			203,193,000
Noncontrolling Interest			(1,896,000)
Goodwill			152,472,000
Total Estimated Purchase Price, net of Cash Acquired			353,769,000
Trade Name | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:			26,753,000
Customer Lists | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:			123,061,000
Technology | IP Cleaning S.p.A
ASSETS
Intangible Assets Subject to Amortization:			$ 9,631,000