CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income	$ 4,715	$ 3,229
Other comprehensive income (loss):
Net change in unrealized gain (loss) on investments	8	(22)
Provision (benefit) for income taxes related to items of other comprehensive income	4	(9)
Other comprehensive income (loss), net of tax	4	(13)
Comprehensive income	$ 4,719	$ 3,216