Subsequent Events (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended		0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Oct. 30, 2013 Subsequent events
Subsequent events
Distribution to common unitholders (in dollars per unit)			$ 0.35
Expected total distribution	$ (27,261)	$ (23,865)	$ 12,500