Consolidated Balance Sheets (USD $)	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 389,678,664	$ 357,986,774
Short-term investments	60,802,856	60,808,237
Accounts receivable	109,579,693	110,389,715
Inventories	159,930,266	188,753,312
Prepaid expenses and other	24,671,561	34,354,946
Total current assets	744,663,040	752,292,984
PLANT AND EQUIPMENT:
Land, buildings and improvements	198,156,137	130,290,789
Machinery and equipment	472,844,579	415,394,183
Construction-in-process	45,092,001	58,244,561
Plant and equipment, gross	716,092,717	603,929,533
Less-Accumulated depreciation and amortization	(366,154,545)	(321,387,945)
Plant and equipment, net	349,938,172	282,541,588
OTHER ASSETS:
Long-term investments	141,834,034	128,168,165
Patents and other assets, net	29,256,089	13,024,265
Total other assets	171,090,123	141,192,430
TOTAL ASSETS	1,265,691,335	1,176,027,002
LIABILITIES AND SHAREHOLDERS’ INVESTMENT
Accounts payable	43,200,002	65,470,573
Accrued liabilities:
Salaries, wages and vacation	7,188,092	6,558,638
Income taxes	1,582,570	0
Royalties	9,889,708	6,745,877
Dividends declared	18,599,926	17,288,348
Other	7,497,144	4,631,064
Total current liabilities	87,957,442	100,694,500
DEFERRED INCOME TAXES	56,773,337	48,213,981
SHAREHOLDERS’ INVESTMENT:
Preferred stock, no par value, 5,000,000 shares authorized; none issued or outstanding	0	0
Common stock, par value $.06 per share; 200,000,000 shares authorized; 143,076,357 shares issued and outstanding in 2012 and 144,069,563 shares issued and outstanding in 2011	8,584,581	8,644,174
Additional paid-in capital	418,766,010	395,229,891
Retained earnings	676,039,254	610,702,253
Accumulated other comprehensive income:
Unrealized gain on investments	15,111,778	10,412,246
Cumulative translation adjustment	2,458,933	2,129,957
Total shareholders’ investment	1,120,960,556	1,027,118,521
TOTAL LIABILITES AND SHAREHOLDERS' INVESTMENT	$ 1,265,691,335	$ 1,176,027,002