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Condensed Consolidated Statements Of Income (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements Of Income [Abstract]        
NET SALES $ 280,255,548 $ 243,001,541 $ 570,962,310 $ 493,947,438
COST OF GOODS SOLD 187,498,242 157,376,970 377,378,511 318,006,130
Gross profit 92,757,306 85,624,571 193,583,799 175,941,308
OPERATING EXPENSES:        
Engineering, research and development 22,792,503 20,245,757 46,007,637 39,160,518
Selling, general & administrative 12,452,571 12,131,922 24,562,967 23,443,024
Total operating expenses 35,245,074 32,377,679 70,570,604 62,603,542
Operating income 57,512,232 53,246,892 123,013,195 113,337,766
OTHER INCOME:        
Investment income 633,700 598,455 1,229,723 1,098,025
Other, net 2,533,783 3,902,721 5,224,120 6,767,539
Total other income 3,167,483 4,501,176 6,453,843 7,865,564
Income before provision for income taxes 60,679,715 57,748,068 129,467,038 121,203,330
PROVISION FOR INCOME TAXES 19,913,176 19,275,899 42,355,915 40,398,279
NET INCOME $ 40,766,539 $ 38,472,169 $ 87,111,123 $ 80,805,051
EARNINGS PER SHARE:        
Basic $ 0.28 $ 0.27 $ 0.61 $ 0.57
Diluted $ 0.28 $ 0.27 $ 0.60 $ 0.56
Cash Dividends Declared per Share $ 0.13 $ 0.12 $ 0.26 $ 0.24