CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 2,139	$ 8,617
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on investments in securities	(65)	26
Comprehensive income	$ 2,074	$ 8,643