Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
NET SALES	$ 443,139,073	$ 423,800,778	$ 896,674,323	$ 829,368,564
COST OF GOODS SOLD	275,931,278	257,028,219	553,665,743	503,905,217
Gross profit	167,207,795	166,772,559	343,008,580	325,463,347
OPERATING EXPENSES:
Engineering, research and development	25,243,410	23,071,788	50,395,667	46,162,997
Selling, general & administrative	16,099,871	14,955,050	32,321,279	29,705,639
Total operating expenses	41,343,281	38,026,838	82,716,946	75,868,636
Income from operations	125,864,514	128,745,721	260,291,634	249,594,711
OTHER INCOME (LOSS)
Investment income	1,736,138	774,102	3,208,665	1,564,143
Other Loss, net	343,111	(1,911,113)	(691,632)	(3,980,532)
Total Other Income (Loss)	2,079,249	(1,137,011)	2,517,033	(2,416,389)
Income before provision for income taxes	127,943,763	127,608,710	262,808,667	247,178,322
PROVISION FOR INCOME TAXES	39,407,816	41,123,468	76,715,979	80,413,086
NET INCOME	$ 88,535,947	$ 86,485,242	$ 186,092,688	$ 166,765,236
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.31	$ 0.30	$ 0.65	$ 0.58
Diluted (in dollars per share)	0.31	0.30	0.64	0.57
Cash Dividends Declared per Share (in dollars per share)	$ 0.10	$ 0.09	$ 0.19	$ 0.175