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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 311,459,076 | $ 232,589,023
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 71,001,177 | 73,289,065
(Gain) on disposal of assets | (271,510) | (56,257)
Loss on disposal of assets | 250,435 | 22,096
(Gain) on sale of investments and equity method investment income | (2,747,586) | (391,378)
Loss on sale of investments and equity method investment losses | 6,840,692 | 1,248,450
Change in deferred income taxes | (11,870,944) | 4,785,787
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 29,212,236 | 22,973,113
Change in operating assets and liabilities: |  |
Accounts receivable, net | (74,648,395) | (42,618,585)
Inventories | 8,907,490 | (102,018,719)
Prepaid expenses and other | (5,416,624) | (16,978,469)
Accounts payable | 27,451,773 | 52,511,201
Accrued liabilities, excluding dividends declared | 7,500,486 | 11,002,238
Net cash provided by operating activities | 367,668,306 | 236,357,565
Activity in investments: |  |
Sales proceeds | 32,839,883 | 37,429,595
Maturities and calls | 14,435,000 | 3,500,000
Purchases | (112,608,739) | (49,554,476)
Plant and equipment additions | (121,393,801) | (108,475,787)
Proceeds from sale of plant and equipment | 185,610 | 91,949
Increase in other assets | (2,533,687) | (2,310,428)
Net cash used for investing activities | (189,075,734) | (119,319,147)
CASH FLOWS USED FOR FINANCING ACTIVITIES: |  |
Issuance of common stock from stock plan transactions | 24,304,861 | 12,365,103
Cash dividends paid | (84,159,105) | (84,941,178)
Repurchases of common stock | (76,859,341) | (83,840,290)
Net cash used for financing activities | (136,713,585) | (156,416,365)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 41,878,987 | (39,377,947)
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, beginning of period | 218,754,638 | 262,311,670
CASH, CASH EQUIVALENTS, and RESTRICTED CASH, end of period | 260,633,625 | 222,933,723
Property and equipment in accounts payable and accrued expenses and other current liabilities | $ 9,708,125 | $ 5,064,356

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