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Unaudited Condensed Consolidated Statements of Cash Flows (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 77,183,441 us-gaap_NetIncomeLoss |  | $ 68,566,071 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 21,279,105 us-gaap_DepreciationDepletionAndAmortization |  | 19,825,402 us-gaap_DepreciationDepletionAndAmortization
Gain on disposal of assets | (44,414)us-gaap_GainLossOnSaleOfOtherAssets |  | (54,520)us-gaap_GainLossOnSaleOfOtherAssets
Loss on disposal of assets | 221,953 us-gaap_GainLossOnDispositionOfAssets |  | 218,409 us-gaap_GainLossOnDispositionOfAssets
Gain on sale of investments | (2,912,864)us-gaap_GainOnSaleOfInvestments |  | (5,049,229)us-gaap_GainOnSaleOfInvestments
Loss on sale of investments | 300,593 us-gaap_GainLossOnSaleOfInvestments |  | 25,808 us-gaap_GainLossOnSaleOfInvestments
Deferred income taxes | (15,354)us-gaap_DeferredIncomeTaxExpenseBenefit |  | (1,614,318)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense related to employee stock options, employee stock purchases and restricted stock | 5,813,951 us-gaap_ShareBasedCompensation |  | 4,742,080 us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation | (1,073,744)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities |  | (702,580)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Change in operating assets and liabilities: |  |  |
Accounts receivable, net | (33,773,355)us-gaap_IncreaseDecreaseInAccountsReceivable |  | (28,290,721)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | (3,806,065)us-gaap_IncreaseDecreaseInInventories |  | (8,275,303)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other | 15,219,554 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets |  | 534,133 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable | 1,827,677 us-gaap_IncreaseDecreaseInAccountsPayable |  | 7,889,358 us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities, excluding dividends declared | 27,731,368 us-gaap_IncreaseDecreaseInAccruedLiabilities |  | 39,907,356 us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities | 107,951,846 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 97,721,946 us-gaap_NetCashProvidedByUsedInOperatingActivities
Activity in available-for-sale securities: |  |  |
Sales proceeds | 7,540,449 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities |  | 23,856,516 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Purchases | (6,360,397)us-gaap_PaymentsToAcquireAvailableForSaleSecurities |  | (24,487,944)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Plant and equipment additions | (15,160,355)us-gaap_PaymentsToAcquireProductiveAssets |  | (16,417,890)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from sale of plant and equipment | 4 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 35,005 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
(Increase) in other assets | (1,150,642)us-gaap_IncreaseDecreaseInOtherOperatingAssets |  | (285,354)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net cash (used for) investing activities | (15,130,941)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (17,299,667)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS (USED FOR) PROVIDED BY FINANCING ACTIVITIES: |  |  |
Repayment of long-term debt | (1,875,000)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities |  | (1,875,000)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities
Issuance of common stock from stock plan transactions | 9,131,177 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 6,227,631 us-gaap_ProceedsFromIssuanceOfCommonStock
Cash dividends paid | (23,619,837)us-gaap_PaymentsOfDividendsCommonStock |  | (20,380,923)us-gaap_PaymentsOfDividendsCommonStock
Repurchases of common stock | (25,049,145)us-gaap_PaymentsForRepurchaseOfCommonStock |  | 0 us-gaap_PaymentsForRepurchaseOfCommonStock
Excess tax benefits from stock-based compensation | 1,073,744 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  | 702,580 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash (used for) financing activities | (40,339,061)us-gaap_NetCashProvidedByUsedInFinancingActivities |  | (15,325,712)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET INCREASE IN CASH AND CASH EQUIVALENTS | 52,481,844 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 65,096,567 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, beginning of period | 497,429,804 us-gaap_CashAndCashEquivalentsAtCarryingValue | [1] | 309,591,724 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of period | $ 549,911,648 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 374,688,291 us-gaap_CashAndCashEquivalentsAtCarryingValue
[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 outflow in the form of ordinary dividends to common shareholders of the parent entity. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + 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=6871852&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 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + 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 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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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=6871852&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=31042434&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 -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 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + 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=31042434&loc=d3e3602-108585 + Details
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