Consolidated Statements of Changes in Members' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Units	Subordinated Units	Managing Member's Interest
Balance at Mar. 31, 2011	$ 916,973	$ 510,275	$ 390,283	$ 16,415
Increase (Decrease) in Stockholders' Equity
Net earnings (loss)	(165,772)	(82,063)	(80,426)	(3,283)
Distributions to unitholders	(74,568)	(48,981)	(24,101)	(1,486)
Acquisition of interest in parent company	(2,176)	(1,066)	(1,066)	(44)
Acquisition of assets from parent company	428	212	208	8
Issuance of common units	11,000	11,000
Tax benefit of offering costs	4,505	2,208	2,207	90
Balance at Mar. 31, 2012	690,390	391,585	287,105	11,700
Increase (Decrease) in Stockholders' Equity
Net earnings (loss)	(43,601)	(21,584)	(21,154)	(863)
Distributions to unitholders	(49,412)	(48,359)	(74)	(979)
Balance at Mar. 31, 2013	597,377	321,642	265,877	9,858
Increase (Decrease) in Stockholders' Equity
Cancellation of subordinated units			(265,877)	265,877
Net earnings (loss)	(8,957)	(8,786)		(171)
Distributions to unitholders	(52,321)	(51,293)		(1,028)
Issuance of common units	18,041	18,041
Balance at Mar. 31, 2014	$ 554,140	$ 279,604		$ 274,536