Unaudited Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 524,323,560	$ 569,734,496	[1]
Short-term investments	152,179,408	152,538,054	[1]
Accounts receivable, net	246,427,239	231,121,788	[1]
Inventories	207,232,952	216,765,583	[1]
Prepaid expenses and other	11,531,029	14,403,902	[1]
Total current assets	1,141,694,188	1,184,563,823	[1]
PLANT AND EQUIPMENT—NET	496,274,467	492,479,330	[1]
OTHER ASSETS
Goodwill	307,365,845	307,365,845	[1]
Long-term investments	3,240,000	57,782,418	[1]
Intangible Assets, net	284,150,000	288,975,000	[1]
Patents and other assets, net	21,627,968	20,887,496	[1]
Total other assets	616,383,813	675,010,759	[1]
Total assets	2,254,352,468	2,352,053,912	[1]
CURRENT LIABILITIES
Accounts payable	77,307,897	89,898,467	[1]
Current portion of long-term debt	50,000,000	78,000,000
Accrued liabilities	100,861,709	75,748,540
Total current liabilities	228,169,606	243,647,007	[1]
DEFERRED INCOME TAXES	56,205,366	58,888,644	[1]
TOTAL LIABILITIES	284,374,972	302,535,651	[1]
SHAREHOLDERS’ INVESTMENT
Common stock	16,431,263	16,816,879	[1]
Additional paid-in capital	742,491,728	723,510,672	[1]
Retained earnings	1,208,841,516	1,301,997,327	[1]
Accumulated other comprehensive income	2,212,989	7,193,383	[1]
Total shareholders’ investment	1,969,977,496	2,049,518,261	[1]
Total liabilities and shareholders’ investment	$ 2,254,352,468	$ 2,352,053,912	[1]

[1] The condensed consolidated balance sheet at December 31, 2017 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.