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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 186,092,688 |  | $ 166,765,236
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 50,428,320 |  | 45,789,787
Gain on disposal of assets | (83,667) |  | (10,900)
Loss on disposal of assets | 286,318 |  | 705,381
Gain on sale of investments | (876,496) |  | (1,657,211)
Loss on sale of investments | 37,718 |  | 2,144,668
Deferred income taxes | 7,008,364 |  | (402,154)
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 9,114,708 |  | 9,777,427
Change in operating assets and liabilities: |  |  |
Accounts receivable, net | (17,658,594) |  | (23,473,550)
Inventories | (7,228,785) |  | (1,531,186)
Prepaid expenses and other | 16,812,179 |  | 19,882,083
Accounts payable | 2,957,299 |  | 15,469,383
Accrued liabilities, excluding dividends declared and short-term debt | 16,667,667 |  | 21,670,990
Net cash provided by operating activities | 263,557,719 |  | 255,129,954
Activity in available-for-sale securities: |  |  |
Sales proceeds | 2,179,926 |  | 45,982,921
Maturities and calls | 12,100,000 |  | 0
Purchases | (17,216,593) |  | (165,496,238)
Plant and equipment additions | (56,218,870) |  | (54,832,532)
Proceeds from sale of plant and equipment | 89,701 |  | 516,667
Decrease (Increase) in other assets | 1,783,574 |  | (2,287,732)
Net cash used for investing activities | (57,282,262) |  | (176,116,914)
CASH FLOWS USED FOR FINANCING ACTIVITIES: |  |  |
Repayment of long-term debt | (68,750,000) |  | (18,750,000)
Issuance of common stock from stock plan transactions | 21,929,900 |  | 29,282,769
Cash dividends paid | (51,796,194) |  | (49,334,501)
Repurchases of common stock | (73,556,886) |  | (92,274,871)
Net cash used for financing activities | (172,173,180) |  | (131,076,603)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 34,102,277 |  | (52,063,563)
CASH AND CASH EQUIVALENTS, beginning of period | 546,477,075 | [1] | 551,557,527
CASH AND CASH EQUIVALENTS, end of period | $ 580,579,352 |  | $ 499,493,964
[1] | Note: The condensed consolidated balance sheet at December 31, 2016 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.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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