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Consolidated Statements Of Income (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Income [Abstract]      
NET SALES $ 1,023,762,049 $ 816,263,414 $ 544,522,993
COST OF GOODS SOLD 662,181,714 520,573,101 366,968,216
Gross profit 361,580,335 295,690,313 177,554,777
OPERATING EXPENSES:      
Engineering, research and development 81,634,158 64,100,411 47,128,086
Selling, general and administrative 48,578,252 40,617,833 35,807,622
Total operating expenses 130,212,410 104,718,244 82,935,708
Income from operations 231,367,925 190,972,069 94,619,069
OTHER INCOME (EXPENSE)      
Investment income 4,165,809 2,901,956 3,321,853
Impairment loss on available-for-sale securities     (1,290,590)
Other, net 8,898,077 9,565,989 (298,029)
Total other income (expense) 13,063,886 12,467,945 1,733,234
Income before provision for income taxes 244,431,811 203,440,014 96,352,303
PROVISION FOR INCOME TAXES 79,763,583 65,706,045 31,715,218
NET INCOME $ 164,668,228 $ 137,733,969 $ 64,637,085
EARNINGS PER SHARE:      
Basic $ 1.16 $ 0.99 $ 0.47
Diluted $ 1.14 $ 0.98 $ 0.47
Cash Dividends Declared per Share $ 0.48 $ 0.44 $ 0.44