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Segment Reporting (Schedule Of Automotive And Other Segment Reporting) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 338,436,964 | $ 286,973,898 | $ 674,176,308 | $ 556,472,867
Income from operations | 99,835,438 | 71,596,271 | 197,012,984 | 135,449,910
Automotive Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 329,557,679 | 279,789,872 | 655,921,786 | 542,757,372
Income from operations | 96,849,968 | 69,959,655 | 190,294,435 | 132,621,089
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 8,879,285 | 7,184,026 | 18,254,522 | 13,715,495
Income from operations | $ 2,985,470 | $ 1,636,616 | $ 6,718,549 | $ 2,828,821

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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