Condensed Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
NET SALES	$ 288,621,626	$ 268,248,089	$ 845,094,493	$ 839,210,399
COST OF GOODS SOLD	182,659,141	178,132,021	543,055,886	555,510,532
Gross profit	105,962,485	90,116,068	302,038,607	283,699,867
OPERATING EXPENSES:
Engineering, research and development	19,106,682	20,434,012	56,654,440	66,441,649
Selling, general & administrative	13,199,557	12,058,701	36,278,011	36,621,668
Total operating expenses	32,306,239	32,492,713	92,932,451	103,063,317
Income from operations	73,656,246	57,623,355	209,106,156	180,636,550
OTHER INCOME
Investment income	474,084	586,517	1,595,214	1,816,240
Other, net	6,912,924	3,476,189	13,224,735	8,700,309
Total other income	7,387,008	4,062,706	14,819,949	10,516,549
Income before provision for income taxes	81,043,254	61,686,061	223,926,105	191,153,099
PROVISION FOR INCOME TAXES	25,522,293	19,808,978	70,877,180	62,164,893
NET INCOME	$ 55,520,961	$ 41,877,083	$ 153,048,925	$ 128,988,206
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.39	$ 0.29	$ 1.07	$ 0.90
Diluted (in dollars per share)	$ 0.38	$ 0.29	$ 1.06	$ 0.89
Cash Dividends Declared per Share (in dollars per share)	$ 0.14	$ 0.13	$ 0.42	$ 0.39