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Segment Reporting (Schedule Of Automotive And Other Segment Reporting) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Total revenue $ 280,255,548 $ 243,001,541 $ 570,962,310 $ 493,947,438
Total income (loss) from operations 57,512,232 53,246,892 123,013,195 113,337,766
Automotive Products [Member]
       
Segment Reporting Information [Line Items]        
Segment revenue 274,820,852 238,191,803 560,505,352 484,482,581
Segment income (loss) from continuing operations 57,139,415 53,515,749 122,610,118 113,926,971
Other [Member]
       
Segment Reporting Information [Line Items]        
Segment revenue 5,434,696 4,809,738 10,456,958 9,464,857
Segment income (loss) from continuing operations $ 372,817 $ (268,857) $ 403,077 $ (589,205)