Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 375,707,033	$ 357,986,774
Short-term investments	45,947,116	60,808,237
Accounts receivable, net	129,948,477	110,389,715
Inventories	192,330,005	188,753,312
Prepaid expenses and other	32,808,457	34,354,946
Total current assets	776,741,088	752,292,984
PLANT AND EQUIPMENT- NET	326,842,448	282,541,588
OTHER ASSETS
Long-term investments	137,556,403	128,168,165
Patents and other assets, net	12,886,088	13,024,265
Total other assets	150,442,491	141,192,430
Total assets	1,254,026,027	1,176,027,002
LIABILITIES AND SHAREHOLDERS' INVESTMENT
Accounts payable	53,514,927	65,470,573
Accrued liabilities	52,497,356	35,223,927
Total current liabilities	106,012,283	100,694,500
DEFERRED INCOME TAXES	53,323,686	48,213,981
SHAREHOLDERS' INVESTMENT
Common stock	8,673,968	8,644,174
Additional paid-in capital	410,631,715	395,229,891
Retained earnings	660,271,990	610,702,253
Other shareholders' investment	15,112,385	12,542,203
Total shareholders' investment	1,094,690,058	1,027,118,521
Total liabilities and shareholders' investment	$ 1,254,026,027	$ 1,176,027,002