Inventories (Schedule of Inventories) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 80,959,971	$ 75,081,810
Work-in-process	21,871,552	21,409,976
Finished goods	25,517,944	23,582,378
Total Inventory	$ 128,349,467	$ 120,074,164