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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 $ 77,183,441us-gaap_NetIncomeLoss $ 68,566,071us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21,279,105us-gaap_DepreciationDepletionAndAmortization 19,825,402us-gaap_DepreciationDepletionAndAmortization
Gain on disposal of assets (44,414)us-gaap_GainLossOnSaleOfOtherAssets (54,520)us-gaap_GainLossOnSaleOfOtherAssets
Loss on disposal of assets 221,953us-gaap_GainLossOnDispositionOfAssets 218,409us-gaap_GainLossOnDispositionOfAssets
Gain on sale of investments (2,912,864)us-gaap_GainOnSaleOfInvestments (5,049,229)us-gaap_GainOnSaleOfInvestments
Loss on sale of investments 300,593us-gaap_GainLossOnSaleOfInvestments 25,808us-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 5,813,951us-gaap_ShareBasedCompensation 4,742,080us-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 15,219,554us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 534,133us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 1,827,677us-gaap_IncreaseDecreaseInAccountsPayable 7,889,358us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities, excluding dividends declared 27,731,368us-gaap_IncreaseDecreaseInAccruedLiabilities 39,907,356us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 107,951,846us-gaap_NetCashProvidedByUsedInOperatingActivities 97,721,946us-gaap_NetCashProvidedByUsedInOperatingActivities
Activity in available-for-sale securities:    
Sales proceeds 7,540,449us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 23,856,516us-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 4us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 35,005us-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 9,131,177us-gaap_ProceedsFromIssuanceOfCommonStock 6,227,631us-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 0us-gaap_PaymentsForRepurchaseOfCommonStock
Excess tax benefits from stock-based compensation 1,073,744us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 702,580us-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 52,481,844us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 65,096,567us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS, beginning of period 497,429,804us-gaap_CashAndCashEquivalentsAtCarryingValue [1] 309,591,724us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS, end of period $ 549,911,648us-gaap_CashAndCashEquivalentsAtCarryingValue $ 374,688,291us-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.