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Consolidated Statement of Comprehensive Income (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$ 288,604,579us-gaap_NetIncomeLoss	$ 222,929,949us-gaap_NetIncomeLoss	$ 168,586,840us-gaap_NetIncomeLoss
Other comprehensive income (loss) before tax:
Foreign currency translation adjustments	(1,104,023)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	48,989us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	328,976us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Unrealized gains (losses) on derivatives	(1,475,702)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Unrealized gains (losses) on available-for sales securities, net	(13,229,414)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6,701,020us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	7,230,048us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Other comprehensive income (loss), before tax	(15,809,139)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	6,750,009us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	7,559,024us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Provision for income taxes related to components of other comprehensive income	(5,146,791)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	2,345,357us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	2,530,516us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive Income (loss), net of tax	(10,662,348)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	4,404,652us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5,028,508us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive Income	$ 277,942,231us-gaap_ComprehensiveIncomeNetOfTax	$ 227,334,601us-gaap_ComprehensiveIncomeNetOfTax	$ 173,615,348us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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