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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 19,972us-gaap_NetIncomeLoss	$ 17,334us-gaap_NetIncomeLoss	$ 46,558us-gaap_NetIncomeLoss	$ 52,273us-gaap_NetIncomeLoss
Other comprehensive income:
Change in unrealized net gain on investments	143us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	724us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	214us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1,291us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments	(344)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(254)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(669)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	(473)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Net current-period other comprehensive income/(loss)	(201)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	470us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(455)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	818us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 19,771us-gaap_ComprehensiveIncomeNetOfTax	$ 17,804us-gaap_ComprehensiveIncomeNetOfTax	$ 46,103us-gaap_ComprehensiveIncomeNetOfTax	$ 53,091us-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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