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Condensed Consolidated Balance Sheets (USD $)
Mar. 31, 2012
Dec. 31, 2011
ASSETS    
Cash and cash equivalents $ 370,804,725 $ 357,986,774
Short-term investments 51,989,936 60,808,237
Accounts receivable, net 139,296,845 110,389,715
Inventories 200,751,160 188,753,312
Prepaid expenses and other 23,425,298 34,354,946
Total current assets 786,267,964 752,292,984
PLANT AND EQUIPMENT- NET 309,663,660 282,541,588
OTHER ASSETS    
Long-term investments 146,155,364 128,168,165
Patents and other assets, net 13,060,218 13,024,265
Total other assets 159,215,582 141,192,430
Total assets 1,255,147,206 1,176,027,002
LIABILITIES AND SHAREHOLDERS' INVESTMENT    
Accounts payable 72,986,047 65,470,573
Accrued liabilities 57,118,552 35,223,927
Total current liabilities 130,104,599 100,694,500
DEFERRED INCOME TAXES 54,771,435 48,213,981
SHAREHOLDERS' INVESTMENT    
Common stock 8,653,024 8,644,174
Additional paid-in capital 401,647,926 395,229,891
Retained earnings 638,299,049 610,702,253
Other shareholders' investment 21,671,173 12,542,203
Total shareholders' investment 1,070,271,172 1,027,118,521
Total liabilities and shareholders' investment $ 1,255,147,206 $ 1,176,027,002