Unaudited Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018	[1]	Jun. 30, 2018
CURRENT ASSETS
Cash and cash equivalents	$ 260,332,892	$ 217,025,278
Short-term investments	190,565,065	169,412,999
Accounts receivable, net	226,426,332	213,537,799
Inventories	225,094,463	225,281,599
Prepaid expenses and other	27,984,155	25,672,579
Total current assets	930,402,907	850,930,254
PLANT AND EQUIPMENT—NET	501,398,382	498,473,766
OTHER ASSETS
Goodwill	307,365,845	307,365,845
Long-term investments	121,061,221	137,979,082
Intangible assets, net	260,025,000	269,675,000
Patents and other assets, net	22,549,518	21,010,121
Total other assets	711,001,584	736,030,048
Total assets	2,142,802,873	2,085,434,068
CURRENT LIABILITIES
Accounts payable	90,041,087	92,810,316
Accrued liabilities	87,519,710	76,350,603
Total current liabilities	177,560,797	169,160,919
OTHER NON-CURRENT LIABILITIES	6,190,219	0
DEFERRED INCOME TAXES	54,717,622	54,521,489
Total liabilities	238,468,638	223,682,408
SHAREHOLDERS’ INVESTMENT
Common stock	15,286,747	15,559,717
Additional paid-in capital	777,238,253	745,324,144
Retained earnings	1,111,310,014	1,102,468,137
Accumulated other comprehensive income (loss)	499,221	(1,600,338)		$ (479,104)
Total shareholders’ investment	1,904,334,235	1,861,751,660		$ 1,921,499,312
Total liabilities and shareholders’ investment	$ 2,142,802,873	$ 2,085,434,068

[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.