Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
NET SALES	$ 460,253,433	$ 438,627,786	$ 1,380,654,978	$ 1,335,302,109
COST OF GOODS SOLD	287,263,147	267,398,126	862,231,819	821,063,869
Gross profit	172,990,286	171,229,660	518,423,159	514,238,240
OPERATING EXPENSES:
Engineering, research and development	26,888,999	24,770,279	80,138,722	75,165,946
Selling, general & administrative	18,673,376	17,386,729	55,658,189	49,708,008
Total operating expenses	45,562,375	42,157,008	135,796,911	124,873,954
Income from operations	127,427,911	129,072,652	382,626,248	389,364,286
OTHER INCOME (LOSS)
Investment income	3,180,683	2,139,387	8,062,421	5,348,052
Other income (loss), net	(73,979)	(379,996)	578,655	(1,071,628)
Total Other Income	3,106,704	1,759,391	8,641,076	4,276,424
Income before provision for income taxes	130,534,615	130,832,043	391,267,324	393,640,710
PROVISION FOR INCOME TAXES	19,198,798	40,601,708	59,658,782	117,317,687
NET INCOME	$ 111,335,817	$ 90,230,335	$ 331,608,542	$ 276,323,023
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.42	$ 0.32	$ 1.23	$ 0.97
Diluted (in dollars per share)	0.42	0.31	1.22	0.96
Cash Dividends Declared per Share (in dollars per share)	$ 0.11	$ 0.10	$ 0.33	$ 0.29