Segment Reporting (Schedule of Automotive and Other Segment Reporting) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 474,638,584	$ 477,761,417	$ 1,158,325,866	$ 1,415,061,768
Income from operations	138,852,889	128,135,680	237,141,800	377,636,979
Automotive Products
Segment Reporting Information [Line Items]
Revenue	464,673,587	464,280,707	1,126,597,020	1,376,704,413
Income from operations	138,428,628	123,342,538	233,149,936	364,590,462
Other
Segment Reporting Information [Line Items]
Revenue	9,964,997	13,480,710	31,728,846	38,357,355
Income from operations	$ 424,261	$ 4,793,142	$ 3,991,864	$ 13,046,517