Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
NET SALES	$ 438,627,786	$ 429,643,276	$ 1,335,302,109	$ 1,259,011,840
COST OF GOODS SOLD	267,398,126	255,821,376	821,063,869	759,726,593
Gross profit	171,229,660	173,821,900	514,238,240	499,285,247
OPERATING EXPENSES:
Engineering, research and development	24,770,279	23,585,115	75,165,946	69,748,112
Selling, general & administrative	17,386,729	16,024,504	49,708,008	45,730,143
Total operating expenses	42,157,008	39,609,619	124,873,954	115,478,255
Income from operations	129,072,652	134,212,281	389,364,286	383,806,992
OTHER INCOME (LOSS)
Investment income	2,139,387	916,556	5,348,052	2,480,699
Other Loss, net	(379,996)	(800,855)	(1,071,628)	(4,781,387)
Total Other Income (Loss)	1,759,391	115,701	4,276,424	(2,300,688)
Income before provision for income taxes	130,832,043	134,327,982	393,640,710	381,506,304
PROVISION FOR INCOME TAXES	40,601,708	42,263,336	117,317,687	122,676,422
NET INCOME	$ 90,230,335	$ 92,064,646	$ 276,323,023	$ 258,829,882
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.32	$ 0.32	$ 0.97	$ 0.90
Diluted (in dollars per share)	0.31	0.32	0.96	0.89
Cash Dividends Declared per Share (in dollars per share)	$ 0.10	$ 0.09	$ 0.29	$ 0.265