Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 1,979	$ 6,007
Foreign currency translation adjustments	1,356	(5,100)
Changes in unrealized gain (loss), net of taxes (benefits) of $(152) and $18	(286)	34
Reclassification adjustment for net losses (gains) realized in net income, net of taxes (benefits) of $(31) and $17	(57)	31
Net change in market value of investments	(343)	65
Total comprehensive income	$ 2,992	$ 972