Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
NET SALES	$ 423,800,778	$ 379,258,477	$ 829,368,564	$ 748,195,932
COST OF GOODS SOLD	257,028,219	233,715,046	503,905,217	459,560,092
Gross profit	166,772,559	145,543,431	325,463,347	288,635,840
OPERATING EXPENSES:
Engineering, research and development	23,071,788	22,315,244	46,162,997	43,902,795
Selling, general & administrative	14,955,050	15,095,357	29,705,639	28,891,709
Total operating expenses	38,026,838	37,410,601	75,868,636	72,794,504
Income from operations	128,745,721	108,132,830	249,594,711	215,841,336
OTHER INCOME (LOSS)
Investment income	774,102	754,052	1,564,143	1,366,077
Other (Loss) Income, net	(1,911,113)	1,563,291	(3,980,532)	1,660,650
Total other (loss) income	(1,137,011)	2,317,343	(2,416,389)	3,026,727
Income before provision for income taxes	127,608,710	110,450,173	247,178,322	218,868,063
PROVISION FOR INCOME TAXES	41,123,468	35,891,736	80,413,086	67,126,185
NET INCOME	$ 86,485,242	$ 74,558,437	$ 166,765,236	$ 151,741,878
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.30	$ 0.25	$ 0.58	$ 0.52
Diluted (in dollars per share)	0.30	0.25	0.57	0.51
Cash Dividends Declared per Share (in dollars per share)	$ 0.09	$ 0.085	$ 0.175	$ 0.165