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Segment Reporting (Schedule Of Automotive And Other Segment Reporting) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 350,913,912 | $ 288,621,626 | $ 1,025,090,220 | $ 845,094,493
Income from operations | 103,205,827 | 73,656,246 | 300,218,811 | 209,106,156
Automotive Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 341,786,404 | 280,924,112 | 997,708,190 | 823,681,484
Income from operations | 100,053,622 | 71,376,726 | 290,348,056 | 203,997,815
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 9,127,508 | 7,697,514 | 27,382,030 | 21,413,009
Income from operations | $ 3,152,205 | $ 2,279,520 | $ 9,870,755 | $ 5,108,341

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