Consolidated statement of stockholders equity (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Opening Balance			$ 160,466
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	9,579	8,515	26,267	17,970
closing balance	189,460		189,460
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income (loss)	$ 9,579	$ 8,515	$ 26,267	$ 17,970