Consolidated Statements of Earnings (Loss) and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Fee-based revenue	$ 31,471	$ 37,061
Optimization, net	25,718	(39,848)
Total revenues	57,189	(2,787)
Expenses (income):
Operating	10,444	8,091
General and administrative	11,290	9,839
Depreciation and amortization	10,333	11,824
Interest	16,206	16,508
Loss on extinguishment of debt		599
Foreign exchange losses (gains)	858	(185)
Other expense (income)	391	(176)
INCOME (LOSS) BEFORE INCOME TAXES	7,667	(49,287)
Income tax benefit	(300)	(11,941)
NET EARNINGS (LOSS) AND COMPREHENSIVE INCOME (LOSS)	7,967	(37,346)
Net earnings (loss) allocated to:
Managing Member	158	(740)
Common unitholders	7,809	(18,487)
Subordinated unitholder (Notes 1 and 6)		$ (18,119)
Earnings (loss) per unit allocated to common unitholders
basic (in dollars per unit)	$ 0.23	$ (0.54)
diluted (in dollars per unit)	$ 0.23	$ (0.54)
Earnings (loss) per unit allocated to subordinated unitholders
basic (in dollars per unit) (Notes 1 and 6)		$ (0.54)
diluted (in dollars per unit) (Notes 1 and 6)		$ (0.54)