Unaudited Condensed Consolidated Statements of Income (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
NET SALES	$ 368,937,455	$ 335,739,344
COST OF GOODS SOLD	225,845,046	204,440,537
Gross profit	143,092,409	131,298,807
OPERATING EXPENSES:
Engineering, research and development	21,587,551	20,489,227
Selling, general & administrative	13,796,352	13,632,034
Total operating expenses	35,383,903	34,121,261
Income from operations	107,708,506	97,177,546
OTHER INCOME
Investment income	612,025	325,158
Other, net	97,359	4,189,386
Total other income	709,384	4,514,544
Income before provision for income taxes	108,417,890	101,692,090
PROVISION FOR INCOME TAXES	31,234,449	33,126,019
NET INCOME	$ 77,183,441	$ 68,566,071
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.26	$ 0.24
Diluted (in dollars per share)	$ 0.26	$ 0.23
Cash Dividends Declared per Share (in dollars per share)	$ 0.08	$ 0.07