Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
NET SALES	$ 429,643,276	$ 389,829,139	$ 1,259,011,840	$ 1,138,025,071
COST OF GOODS SOLD	255,821,376	237,932,439	759,726,593	697,492,531
Gross profit	173,821,900	151,896,700	499,285,247	440,532,540
OPERATING EXPENSES:
Engineering, research and development	23,585,115	21,505,461	69,748,112	65,408,256
Selling, general & administrative	16,024,504	14,128,619	45,730,143	43,020,328
Total operating expenses	39,609,619	35,634,080	115,478,255	108,428,584
Income from operations	134,212,281	116,262,620	383,806,992	332,103,956
OTHER INCOME (LOSS)
Investment income	916,556	495,468	2,480,699	1,861,545
Other Income (Loss), net	(800,855)	(710,346)	(4,781,387)	950,304
Total Other Income (Loss)	115,701	(214,878)	(2,300,688)	2,811,849
Income before provision for income taxes	134,327,982	116,047,742	381,506,304	334,915,805
PROVISION FOR INCOME TAXES	42,263,336	37,715,317	122,676,422	104,841,502
NET INCOME	$ 92,064,646	$ 78,332,425	$ 258,829,882	$ 230,074,303
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.32	$ 0.27	$ 0.90	$ 0.78
Diluted (in dollars per share)	0.32	0.27	0.89	0.77
Cash Dividends Declared per Share (in dollars per share)	$ 0.09	$ 0.085	$ 0.265	$ 0.25