Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
NET SALES	$ 453,535,250	$ 405,567,786
COST OF GOODS SOLD	277,734,465	246,876,998
Gross profit	175,800,785	158,690,788
OPERATING EXPENSES:
Engineering, research and development	25,152,257	23,091,209
Selling, general & administrative	16,221,408	14,750,589
Total operating expenses	41,373,665	37,841,798
Income from operations	134,427,120	120,848,990
OTHER INCOME (LOSS)
Investment income	1,472,527	790,041
Other Loss, net	(1,034,743)	(2,069,419)
Total Other Income (Loss)	437,784	(1,279,378)
Income before provision for income taxes	134,864,904	119,569,612
PROVISION FOR INCOME TAXES	37,308,163	39,289,618
NET INCOME	$ 97,556,741	$ 80,279,994
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.34	$ 0.28
Diluted (in dollars per share)	0.33	0.28
Cash Dividends Declared per Share (in dollars per share)	$ 0.09	$ 0.085