Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
NET SALES	$ 389,829,139	$ 350,913,912	$ 1,138,025,071	$ 1,025,090,220
COST OF GOODS SOLD	237,932,439	212,288,220	697,492,531	620,873,493
Gross profit	151,896,700	138,625,692	440,532,540	404,216,727
OPERATING EXPENSES:
Engineering, research and development	21,505,461	21,671,940	65,408,256	62,395,241
Selling, general & administrative	14,128,619	13,747,925	43,020,328	41,602,675
Total operating expenses	35,634,080	35,419,865	108,428,584	103,997,916
Income from operations	116,262,620	103,205,827	332,103,956	300,218,811
OTHER INCOME
Investment income	495,468	406,491	1,861,545	1,129,654
Other Income, net	(710,346)	380,289	950,304	9,958,235
Total other income	(214,878)	786,780	2,811,849	11,087,889
Income before provision for income taxes	116,047,742	103,992,607	334,915,805	311,306,700
PROVISION FOR INCOME TAXES	37,715,317	31,655,724	104,841,502	93,677,000
NET INCOME	$ 78,332,425	$ 72,336,883	$ 230,074,303	$ 217,629,700
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.27	$ 0.25	$ 0.78	$ 0.75
Diluted (in dollars per share)	0.27	0.25	0.77	0.74
Cash Dividends Declared per Share (in dollars per share)	$ 0.085	$ 0.08	$ 0.25	$ 0.23