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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 26,586	$ 34,939
Other comprehensive income:
Change in unrealized net gain on investments	71	567
Reclassification from accumulated other comprehensive income to interest income for accretion of non-current investments	(325)	(219)
Net current-period other comprehensive income/(loss)	(254)	348
Comprehensive income	$ 26,332	$ 35,287

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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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