Segment Reporting (Schedule of Major Product Line Revenues) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Revenues	$ 459,570,000	$ 438,628,000	$ 443,139,000	$ 453,535,000	$ 419,913,000	$ 429,643,000	$ 423,801,000	$ 405,568,000	$ 1,794,872,578	$ 1,678,924,756	$ 1,543,617,706
Automotive Products
Revenue from External Customer [Line Items]
Revenues									1,758,127,468	1,639,692,243	1,506,872,004
Automotive Products | Automotive Mirrors
Revenue from External Customer [Line Items]
Revenues									1,573,222,820	1,456,963,758	1,332,791,398
Automotive Products | HomeLink Modules
Revenue from External Customer [Line Items]
Revenues									184,904,648	182,728,485	174,080,606
Other | Other Products Revenue
Revenue from External Customer [Line Items]
Revenues									$ 36,745,110	$ 39,232,513	$ 36,745,702