Acquisitions (Details 1) - USD ($)		3 Months Ended								9 Months Ended	12 Months Ended
	Apr. 06, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Proceeds from Sale of Business										$ 4,000,000	$ 4,000,000	$ 0	$ 285,000
Gain (Loss) on Disposition of Business										$ 1,000,000
Goodwill		$ 182,671,000				$ 186,044,000					182,671,000	186,044,000	21,065,000
Amortization expense											22,129,000	17,054,000	409,000
Net Sales		285,212,000	$ 273,255,000	$ 292,197,000	$ 272,847,000	279,295,000	$ 261,921,000	$ 270,791,000	$ 191,059,000		1,123,511,000	1,003,066,000	808,572,000
Net Earnings		7,717,000	$ 9,676,000	$ 12,744,000	$ 3,274,000	$ (3,206,000)	$ 3,559,000	$ (2,591,000)	$ (3,957,000)		33,412,000	$ (6,195,000)	$ 46,614,000
Senior Secured Credit Facility
Business Acquisition [Line Items]
Long-term Line of Credit, Noncurrent	$ 420,000,000
IP Cleaning S.p.A
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Combination, Consideration Transferred	$ 353,769,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	8,804,000	159,445,000									159,445,000
Goodwill	152,472,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 0
Intangible Assets Subject to Amortization:		$ 4,627,000									$ 4,627,000
Weighted-average original life (in years)	10 years										15 years
Amortization expense											$ 20,794,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 118,271,000
Customer Lists
Business Acquisition [Line Items]
Weighted-average original life (in years)											15 years	15 years
Customer Lists | IP Cleaning S.p.A
Business Acquisition [Line Items]
Intangible Assets Subject to Amortization:	123,061,000
Trade Name
Business Acquisition [Line Items]
Weighted-average original life (in years)											10 years	10 years
Trade Name | IP Cleaning S.p.A
Business Acquisition [Line Items]
Intangible Assets Subject to Amortization:	26,753,000
Technology
Business Acquisition [Line Items]
Weighted-average original life (in years)											10 years	11 years
Technology | IP Cleaning S.p.A
Business Acquisition [Line Items]
Intangible Assets Subject to Amortization:	$ 9,631,000