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Segment Reporting (Schedule Of Automotive And Other Segment Reporting) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting Information [Line Items]    
Total revenue $ 290,706,762 $ 250,945,897
Total income (loss) from operations 65,500,963 60,090,874
Automotive Products [Member]
   
Segment Reporting Information [Line Items]    
Segment revenue 285,684,500 246,290,778
Segment income (loss) from continuing operations 65,470,703 60,411,222
Other [Member]
   
Segment Reporting Information [Line Items]    
Segment revenue 5,022,262 4,655,119
Segment income (loss) from continuing operations $ 30,260 $ (320,348)