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Segment Reporting (Schedule Of Automotive And Other Segment Reporting) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 286,973,898 | $ 280,255,548 | $ 556,472,867 | $ 570,962,310
Income (loss) from operations | 71,596,271 | 57,512,232 | 135,449,910 | 123,013,195
Automotive Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 279,789,872 | 274,820,852 | 542,757,372 | 560,505,352
Income (loss) from operations | 69,959,655 | 57,139,415 | 132,621,089 | 122,610,118
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 7,184,026 | 5,434,696 | 13,715,495 | 10,456,958
Income (loss) from operations | $ 1,636,616 | $ 372,817 | $ 2,828,821 | $ 403,077

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