Revenues (Tables)

12 Months Ended

Mar. 31, 2014

Revenues

Schedule of components of fee-based revenue

	Year ended March 31
	2014		2013		2012
Long-term contract revenue	$	83,940	$	108,615	$	116,244
Short-term contract revenue		51,416		54,710		29,809
	$	135,356	$	163,325	$	146,053

Schedule of components of optimization, net

	Year ended March 31,
	2014			2013			2012
Realized optimization, net	$	85,372		$	89,525		$	62,735
Unrealized risk management (loss)
gains (Notes 12 and 13)		(8,732	)		(89,874	)		83,193
Write-down of inventory		(4,600	)		(22,281	)		(23,400	)
	$	72,040		$	(22,630	)	$	122,528