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Segment Reporting
9 Months Ended
Sep. 30, 2018
Segment Reporting [Abstract]  
Segment Reporting Segment ReportingThe Company's automotive segment develops and manufactures digital vision and connected car products and electronics, including: automatic-dimming rearview mirrors with and without electronic features; non-auto dimming rearview mirrors with and without electronic features; and other electronics. The Company also develops and manufactures variably dimming windows for the aerospace industry and fire protection products for the commercial construction industry, which are combined into the "Other" segment shown below.
Three Months Ended September 30, Nine Months Ended September 30, 
2018201720182017
Revenue:
Automotive Products $449,184,447 $428,161,863 $1,348,395,245 $1,307,736,698 
Other 11,068,986 10,465,923 32,259,733 27,565,411 
Total $460,253,433 $438,627,786 $1,380,654,978 $1,335,302,109 
Income from operations:
Automotive Products $124,351,499 $125,817,994 $373,071,852 $381,545,762 
Other 3,076,412 3,254,658 9,554,396 7,818,524 
Total $127,427,911 $129,072,652 $382,626,248 $389,364,286