Unaudited Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2019	Dec. 31, 2018		Mar. 31, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 221,688,575	$ 217,025,278	[1]
Short-term investments	180,313,222	169,412,999	[1]
Accounts receivable, net	244,266,296	213,537,799	[1]
Inventories	225,303,042	225,281,599	[1]
Prepaid expenses and other	14,824,876	25,672,579	[1]
Total current assets	886,396,011	850,930,254	[1]
PLANT AND EQUIPMENT—NET	492,613,112	498,473,766
OTHER ASSETS
Goodwill	307,365,845	307,365,845	[1]
Long-term investments	126,528,508	137,979,082	[1]
Intangible assets, net	264,850,000	269,675,000	[1]
Patents and other assets, net	22,612,152	21,010,121	[1]
Total other assets	721,356,505	736,030,048	[1]
Total assets	2,100,365,628	2,085,434,068	[1]
CURRENT LIABILITIES
Accounts payable	90,117,496	92,810,316	[1]
Accrued liabilities	94,376,376	76,350,603	[1]
Total current liabilities	184,493,872	169,160,919	[1]
OTHER NON-CURRENT LIABILITIES	5,509,373	0	[1]
DEFERRED INCOME TAXES	53,287,636	54,521,489	[1]
Total liabilities	243,290,881	223,682,408
SHAREHOLDERS’ INVESTMENT
Common stock	15,335,060	15,559,717	[1]
Additional paid-in capital	748,641,461	745,324,144	[1]
Retained earnings	1,093,373,960	1,102,468,137	[1]
Accumulated other comprehensive (loss) income	(275,734)	(1,600,338)	[1]	$ 2,212,989
Total shareholders’ investment	1,857,074,747	1,861,751,660	[1]	$ 1,969,977,496
Total liabilities and shareholders’ investment	$ 2,100,365,628	$ 2,085,434,068	[1]

[1] The condensed consolidated balance sheet at December 31, 2018 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.