Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020		Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 03, 2021	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 314,805,654		$ 311,922,787	[1]			$ 314,805,654
Acquisitions							2,848,364
Amortization of intangible assets	5,500,000				$ 5,600,000		16,700,000	$ 16,800,000
Amortization expense, remainder of fiscal year	22,000,000						22,000,000
Amortization expense, year one	22,000,000						22,000,000
Amortization expense, year two	20,000,000						20,000,000
Amortization expense, year three	16,000,000						16,000,000
Amortization expense, year four	12,000,000						$ 12,000,000
HomeLink®
Finite-Lived Intangible Assets [Line Items]
Goodwill										$ 307,400,000
Vaporsens Inc
Finite-Lived Intangible Assets [Line Items]
Acquisitions						$ 3,700,000
Argil, Inc.
Finite-Lived Intangible Assets [Line Items]
Acquisitions			$ 900,000
Goodwill, period increase (decrease)	(100,000)
Air-CraftGlass
Finite-Lived Intangible Assets [Line Items]
Goodwill, period increase (decrease)	$ 200,000
Guardian Optical Technologies
Finite-Lived Intangible Assets [Line Items]
Goodwill									$ 2,848,364
Acquisitions		$ 2,800,000

[1] The condensed consolidated balance sheet at December 31, 2020 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.