Inventories (Schedule of Inventories) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 91,275,645	$ 90,780,320
Work-in-process	24,207,804	24,135,944
Finished goods	30,080,500	26,841,620
Total Inventory	$ 145,563,949	$ 141,757,884	[1]

[1] Note: The condensed consolidated balance sheet at December 31, 2014 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.