Condensed Consolidated Statements Of Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Income [Abstract]
NET SALES	$ 268,248,089	$ 269,467,967	$ 839,210,399	$ 763,415,405
COST OF GOODS SOLD	178,132,021	174,182,650	555,510,532	492,188,780
Gross profit	90,116,068	95,285,317	283,699,867	271,226,625
OPERATING EXPENSES:
Engineering, research and development	20,434,012	20,668,537	66,441,649	59,829,055
Selling, general & administrative	12,058,701	12,370,000	36,621,668	35,813,024
Total operating expenses	32,492,713	33,038,537	103,063,317	95,642,079
Income from operations	57,623,355	62,246,780	180,636,550	175,584,546
OTHER INCOME (EXPENSE)
Investment income	586,517	543,996	1,816,240	1,642,021
Other, net	3,476,189	1,707,840	8,700,309	8,475,379
Total other income	4,062,706	2,251,836	10,516,549	10,117,400
Income before provision for income taxes	61,686,061	64,498,616	191,153,099	185,701,946
PROVISION FOR INCOME TAXES	19,808,978	21,101,552	62,164,893	61,499,831
NET INCOME	$ 41,877,083	$ 43,397,064	$ 128,988,206	$ 124,202,115
EARNINGS PER SHARE:
Basic	$ 0.29	$ 0.30	$ 0.90	$ 0.87
Diluted	$ 0.29	$ 0.30	$ 0.89	$ 0.86
Cash Dividends Declared per Share	$ 0.13	$ 0.12	$ 0.39	$ 0.36