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Inventories (Schedule of Inventories) (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Inventory Disclosure [Abstract] |  |  |
Raw materials | $ 132,138,376 | $ 139,272,129 |
Work-in-process | 31,124,313 | 30,481,192 |
Finished goods | 43,970,263 | 47,012,262 |
Total Inventory | $ 207,232,952 | $ 216,765,583 | [1]
[1] | The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

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