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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income (loss) | $ 213,239,036 | $ 220,272,725
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 53,296,388 | 55,908,679
(Gain) on disposal of assets | (95,658) | (130,647)
Loss on disposal of assets | 340,070 | 10,544
(Gain) on sale of investments | (218,981) | (1,245,359)
Loss on sale of investments | 0 | 529,484
Deferred income taxes | 196,133 | (2,743,537)
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 10,139,148 | 8,652,939
Change in operating assets and liabilities: |  |
Accounts receivable, net | (12,888,533) | (8,284,592)
Inventories | 187,136 | 4,389,930
Prepaid expenses and other | (2,311,576) | (9,171,506)
Accounts payable | (2,769,229) | 16,885,979
Accrued liabilities, excluding dividends declared and short-term debt | 14,353,360 | 7,309,915
Net cash provided by operating activities | 273,467,294 | 292,384,554
Activity in available-for-sale securities: |  |
Sales proceeds | 28,845,319 | 53,822,336
Maturities and calls | 9,714,000 | 21,884,000
Purchases | (40,298,297) | (177,243,275)
Plant and equipment additions | (45,504,667) | (51,860,448)
Proceeds from sale of plant and equipment | 227,738 | 179,700
Decrease in other assets | (1,022,057) | (2,965,781)
Net cash (used for) investing activities | (48,037,964) | (156,183,468)
CASH FLOWS (USED FOR) FINANCING ACTIVITIES: |  |
Repayment of debt | 0 | (54,875,000)
Issuance of common stock from stock plan transactions | 41,934,814 | 52,996,593
Cash dividends paid | (57,918,158) | (58,152,113)
Repurchases of common stock | (166,138,372) | (349,205,921)
Net cash (used for) financing activities | (182,121,716) | (409,236,441)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 43,307,614 | (273,035,355)
CASH AND CASH EQUIVALENTS, beginning of period | 217,025,278 | 569,734,496
CASH AND CASH EQUIVALENTS, end of period | $ 260,332,892 | $ 296,699,141

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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