Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
NET SALES	$ 405,567,786	$ 368,937,455
COST OF GOODS SOLD	246,876,998	225,845,046
Gross profit	158,690,788	143,092,409
OPERATING EXPENSES:
Engineering, research and development	23,091,209	21,587,551
Selling, general & administrative	14,750,589	13,796,352
Total operating expenses	37,841,798	35,383,903
Income from operations	120,848,990	107,708,506
OTHER INCOME (LOSS)
Investment income	790,041	612,025
Other (Loss) Income, net	(2,069,419)	97,359
Total other (loss) income	(1,279,378)	709,384
Income before provision for income taxes	119,569,612	108,417,890
PROVISION FOR INCOME TAXES	39,289,618	31,234,449
NET INCOME	$ 80,279,994	$ 77,183,441
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.28	$ 0.26
Diluted (in dollars per share)	0.28	0.26
Cash Dividends Declared per Share (in dollars per share)	$ 0.085	$ 0.08