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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 151,741,878 |  | $ 145,292,817
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 42,471,227 |  | 39,592,545
Gain on disposal of assets | (18,052) |  | (35,000)
Loss on disposal of assets | 250,247 |  | 374,925
Gain on sale of investments | (4,835,125) |  | (12,213,259)
Loss on sale of investments | 307,110 |  | 647,520
Deferred income taxes | (2,472,624) |  | 667,802
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 11,224,538 |  | 10,147,262
Excess tax benefits from stock-based compensation | (1,629,160) |  | (1,403,740)
Change in operating assets and liabilities: |  |  |
Accounts receivable, net | (28,050,976) |  | (35,234,410)
Inventories | (9,014,610) |  | (5,137,710)
Prepaid expenses and other | 11,612,976 |  | (7,809,607)
Accounts payable | (1,520,783) |  | (689,646)
Accrued liabilities, excluding dividends declared | 21,821,075 |  | 7,906,087
Net cash provided by operating activities | 191,887,721 |  | 142,105,586
Activity in available-for-sale securities: |  |  |
Sales proceeds | 13,805,507 |  | 55,370,528
Purchases | (12,939,815) |  | (52,943,104)
Plant and equipment additions | (33,589,833) |  | (30,248,002)
Proceeds from sale of plant and equipment | 4 |  | 35,005
(Increase) in other assets | (1,084,292) |  | (683,656)
Net cash (used for) investing activities | (33,808,429) |  | (28,469,229)
CASH FLOWS (USED FOR) FINANCING ACTIVITIES: |  |  |
Repayment of long-term debt | (3,750,000) |  | (3,750,000)
Issuance of common stock from stock plan transactions | 13,809,419 |  | 11,576,970
Cash dividends paid | (47,193,926) |  | (40,808,322)
Repurchases of common stock | (50,107,196) |  | 0
Excess tax benefits from stock-based compensation | 1,629,160 |  | 1,403,740
Net cash (used for) financing activities | (85,612,543) |  | (31,577,612)
NET INCREASE IN CASH AND CASH EQUIVALENTS | 72,466,749 |  | 82,058,745
CASH AND CASH EQUIVALENTS, beginning of period | 497,429,804 | [1] | 309,591,724
CASH AND CASH EQUIVALENTS, end of period | $ 569,896,553 |  | $ 391,650,469
[1] | Note: The condensed consolidated balance sheet at December 31, 2014 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 cash inflow (outflow) from long-term debt, including capital lease obligations and mandatory redeemable capital securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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