CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 78,579	$ 78,710
Unrealized holding losses, net of tax effect of ($508) and $4	(10,098)	(279)
Reclassification of recognized transactions, net of tax effect of $0 and ($51)	50	141
Other comprehensive loss, net of taxes	(10,048)	(138)
Total comprehensive income	$ 68,531	$ 78,572