Condensed Consolidated Statements Of Income (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Income [Abstract]
NET SALES	$ 290,706,762	$ 250,945,897
COST OF GOODS SOLD	189,880,269	160,629,160
Gross profit	100,826,493	90,316,737
OPERATING EXPENSES:
Engineering, research and development	23,215,134	18,914,761
Selling, general & administrative	12,110,396	11,311,102
Total operating expenses	35,325,530	30,225,863
Operating income	65,500,963	60,090,874
OTHER INCOME:
Investment income	596,023	499,570
Other, net	2,690,337	2,864,818
Total other income	3,286,360	3,364,388
Income before provision for income taxes	68,787,323	63,455,262
PROVISION FOR INCOME TAXES	22,442,739	21,122,380
NET INCOME	$ 46,344,584	$ 42,332,882
EARNINGS PER SHARE:
Basic	$ 0.32	$ 0.30
Diluted	$ 0.32	$ 0.29
Cash Dividends Declared per Share	$ 0.13	$ 0.12