Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
NET SALES	$ 379,258,477	$ 338,436,964	$ 748,195,932	$ 674,176,308
COST OF GOODS SOLD	233,715,046	204,144,736	459,560,092	408,585,273
Gross profit	145,543,431	134,292,228	288,635,840	265,591,035
OPERATING EXPENSES:
Engineering, research and development	22,315,244	20,234,074	43,902,795	40,723,301
Selling, general & administrative	15,095,357	14,222,716	28,891,709	27,854,750
Total operating expenses	37,410,601	34,456,790	72,794,504	68,578,051
Income from operations	108,132,830	99,835,438	215,841,336	197,012,984
OTHER INCOME
Investment income	754,052	398,005	1,366,077	723,163
Other Income, net	1,563,291	5,388,560	1,660,650	9,577,946
Total other income	2,317,343	5,786,565	3,026,727	10,301,109
Income before provision for income taxes	110,450,173	105,622,003	218,868,063	207,314,093
PROVISION FOR INCOME TAXES	35,891,736	28,895,257	67,126,185	62,021,276
NET INCOME	$ 74,558,437	$ 76,726,746	$ 151,741,878	$ 145,292,817
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.25	$ 0.26	$ 0.52	$ 0.50
Diluted (in dollars per share)	0.25	0.26	0.51	0.50
Cash Dividends Declared per Share (in dollars per share)	$ 0.085	$ 0.08	$ 0.165	$ 0.15