Segment Reporting (Schedule Of Automotive And Other Segment Reporting) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 335,739,344	$ 269,498,969
Income from operations	97,177,546	63,853,639
Automotive Products
Segment Reporting Information [Line Items]
Revenue	326,364,107	262,967,500
Income from operations	93,444,468	62,661,434
Other
Segment Reporting Information [Line Items]
Revenue	9,375,237	6,531,469
Income from operations	$ 3,733,078	$ 1,192,205