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Business Acquisition (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 11, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 365,000
Cash	119
Other current assets	9,315
Current assets	9,434
Property, plant & equipment	4,036
Deferred income taxes	80
Goodwill		$ 615,152		$ 400,440
Other non-current assets	166
Total assets acquired	369,509
Current liabilities assumed	4,462
Total liabilities assumed	4,462
Net assets acquired	365,047
Goodwill, expected tax deductible amount	214,800
Net sales		223,397	$ 211,273
Net income (loss)		8,745	(3,210)
Net sales		218,378	202,064
Cost of Sales
Business Acquisition [Line Items]
Business acquisition costs		660	0
Selling and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition costs		7,245	0
Buffalo Filter LLC
Business Acquisition [Line Items]
Goodwill	$ 214,793
Weighted average amortization period (in years)	16 years
Net sales		$ 6,100
Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 125,000
Customer relationships | Buffalo Filter LLC
Business Acquisition [Line Items]
Weighted average amortization period (in years)	16 years
Developed technology
Business Acquisition [Line Items]
Intangible assets	$ 9,000
Developed technology | Buffalo Filter LLC
Business Acquisition [Line Items]
Weighted average amortization period (in years)	10 years
Trademarks & tradenames
Business Acquisition [Line Items]
Intangible assets	$ 7,000
Trademarks & tradenames | Buffalo Filter LLC
Business Acquisition [Line Items]
Weighted average amortization period (in years)	20 years
Pro Forma [Member] | Cost of Sales
Business Acquisition [Line Items]
Business acquisition costs			700
Pro Forma [Member] | Acquisition-related Costs | Selling and Administrative Expenses
Business Acquisition [Line Items]
Business acquisition costs			$ 7,200

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