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Segment Reporting (Schedule of Automotive and Other Segment Reporting) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 419,913,000 | $ 429,643,000 | $ 423,801,000 | $ 405,568,000 | $ 405,593,000 | $ 389,829,000 | $ 379,258,000 | $ 368,937,000 | $ 1,678,924,756 | $ 1,543,617,706 | $ 1,375,501,159
Income (Loss) from Operations | 127,936,000 | $ 134,212,000 | $ 128,746,000 | $ 120,849,000 | 126,662,000 | $ 116,263,000 | $ 108,133,000 | $ 107,709,000 | 511,742,935 | 458,766,439 | 398,834,174
Assets | 2,309,619,833 |  |  |  | 2,148,672,928 |  |  |  | 2,309,619,833 | 2,148,672,928 | 2,022,540,029
Depreciation & Amortization |  |  |  |  |  |  |  |  | 88,587,430 | 80,599,167 | 77,376,305
Capital Expenditures |  |  |  |  |  |  |  |  | 120,955,614 | 97,941,762 | 72,518,987
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 842,246,344 |  |  |  | 724,816,255 |  |  |  | 842,246,344 | 724,816,255 | 680,082,682
Depreciation & Amortization |  |  |  |  |  |  |  |  | 1,729,886 | 1,366,927 | 1,733,880
Capital Expenditures |  |  |  |  |  |  |  |  | 20,944,269 | 147,996 | 1,341,168
Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,639,692,243 | 1,506,872,004 | 1,340,122,274
Income (Loss) from Operations |  |  |  |  |  |  |  |  | 497,753,966 | 445,067,511 | 386,762,986
Assets | 1,457,989,335 |  |  |  | 1,414,426,679 |  |  |  | 1,457,989,335 | 1,414,426,679 | 1,333,615,389
Depreciation & Amortization |  |  |  |  |  |  |  |  | 86,567,248 | 78,925,332 | 75,320,999
Capital Expenditures |  |  |  |  |  |  |  |  | 99,811,083 | 97,632,519 | 71,032,115
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 39,232,514 | 36,745,702 | 35,378,885
Income (Loss) from Operations |  |  |  |  |  |  |  |  | 13,988,969 | 13,698,928 | 12,071,188
Assets | $ 9,384,154 |  |  |  | $ 9,429,994 |  |  |  | 9,384,154 | 9,429,994 | 8,841,958
Depreciation & Amortization |  |  |  |  |  |  |  |  | 290,296 | 306,908 | 321,426
Capital Expenditures |  |  |  |  |  |  |  |  | 200,262 | 161,247 | 145,704
United States | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 554,945,912 | 494,876,354 | 444,921,897
Germany | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 328,208,190 | 295,044,988 | 262,505,346
Japan | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 154,005,299 | 148,632,237 | 133,758,799
Other | Automotive Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 602,532,841 | $ 568,318,425 | $ 498,936,232

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