Goodwill and Other Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 11, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Intangible assets, Accumulated amortization		$ (206,406)		$ (206,406)		$ (190,742)
Intangible assets, Gross carrying amount		744,616		744,616		603,935
Amortization expense		8,300	$ 5,700	15,700	$ 11,200
Future amortization expense [Abstract]
Remaining, 2019		16,417		16,417
2020		33,301		33,301
2021		32,510		32,510
2022		31,361		31,361
2023		30,507		30,507
2024		29,730		29,730
Amortization included in expense
Future amortization expense [Abstract]
Remaining, 2019		13,417		13,417
2020		27,301		27,301
2021		26,510		26,510
2022		25,361		25,361
2023		24,507		24,507
2024		23,730		23,730
Amortization recorded as a reduction of revenue
Future amortization expense [Abstract]
Remaining, 2019		3,000		3,000
2020		6,000		6,000
2021		6,000		6,000
2022		6,000		6,000
2023		6,000		6,000
2024		6,000		6,000
Trademarks & tradenames
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Unamortized intangible assets, Gross carrying amount		86,544		86,544		86,544
Customer and distributor relationships
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortized intangible assets, Gross carrying amount		338,557		338,557		214,577
Intangible assets, Accumulated amortization		(105,878)		(105,878)		(97,131)
Sales representation, marketing and promotional rights
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortized intangible assets, Gross carrying amount		149,376		149,376		149,376
Intangible assets, Accumulated amortization		(45,000)		(45,000)		(42,000)
Patents and other intangible assets
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortized intangible assets, Gross carrying amount		69,174		69,174		61,473
Intangible assets, Accumulated amortization		(45,339)		(45,339)		(44,242)
Developed technology
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortized intangible assets, Gross carrying amount		100,965		100,965		91,965
Intangible assets, Accumulated amortization		(10,189)		(10,189)		$ (7,369)
Asset Acquisition, Contingent Consideration Liability		$ 4,000		$ 4,000
Weighted Average
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Finite-lived intangible asset useful life (in years)				22 years
Weighted Average | Customer and distributor relationships
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Finite-lived intangible asset useful life (in years)				24 years
Weighted Average | Sales representation, marketing and promotional rights
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Finite-lived intangible asset useful life (in years)				25 years
Weighted Average | Patents and other intangible assets
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Finite-lived intangible asset useful life (in years)				15 years
Weighted Average | Developed technology
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Finite-lived intangible asset useful life (in years)				15 years
Buffalo Filter LLC
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Weighted average amortization period (in years)	16 years
Buffalo Filter LLC | Customer and distributor relationships
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Weighted average amortization period (in years)	16 years
Buffalo Filter LLC | Developed technology
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Finite-lived intangible assets acquired	$ 140,000
Weighted average amortization period (in years)	10 years