Segment Reporting (Schedule of Major Product Line Revenues) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Revenues	$ 453,409,000	$ 460,253,000	$ 454,981,000	$ 465,420,000	$ 459,570,000	$ 438,628,000	$ 443,139,000	$ 453,535,000	$ 1,834,063,697	$ 1,794,872,578	$ 1,678,924,756
Automotive Products
Revenue from External Customer [Line Items]
Revenues									1,791,198,296	1,758,127,468	1,639,692,243
Automotive Products | Automotive Mirrors
Revenue from External Customer [Line Items]
Revenues									1,598,589,777	1,573,222,820	1,456,963,758
Automotive Products | HomeLink Modules
Revenue from External Customer [Line Items]
Revenues									192,608,519	184,904,648	182,728,485
Other
Revenue from External Customer [Line Items]
Revenues									42,865,401	36,745,110
Other | Other Products Revenue
Revenue from External Customer [Line Items]
Revenues									$ 42,865,401	$ 36,745,110	$ 39,232,513