Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 444,619,932	$ 348,349,773
Short-term investments	24,116,803	86,447,596
Accounts receivable, net	111,859,028	95,647,612
Inventories	119,457,528	100,728,730
Prepaid expenses and other	25,591,359	24,095,563
Total current assets	725,644,650	655,269,274
PLANT AND EQUIPMENT - NET	232,716,169	205,107,756
OTHER ASSETS
Long-term investments	142,684,806	129,091,167
Patents and other assets, net	12,974,283	13,222,442
Total other assets	155,659,089	142,313,609
Total assets	1,114,019,908	1,002,690,639
LIABILITIES AND SHAREHOLDERS' INVESTMENT
Accounts payable	63,282,992	40,295,464
Accrued liabilities	40,518,523	31,793,165
Total current liabilities	103,801,515	72,088,629
DEFERRED INCOME TAXES	46,517,399	37,071,184
SHAREHOLDERS' INVESTMENT
Common stock	8,587,110	8,537,528
Additional paid-in capital	368,979,703	347,834,218
Retained earnings	561,344,112	514,842,177
Other shareholders' investment	24,790,069	22,316,903
Total shareholders' investment	963,700,994	893,530,826
Total liabilities and shareholders' investment	$ 1,114,019,908	$ 1,002,690,639