Revenue (Tables)

3 Months Ended

Jun. 30, 2013

Revenues

Schedule of components of fee-based revenue

	Three Months Ended
	June 30,
	2013		2012
Long-term contract revenue	$	20,596	$	27,661
Short-term contract revenue	10,875		9,400
Total	$	31,471	$	37,061

Schedule of components of optimization, net

	Three Months Ended
	June 30,
	2013		2012
Realized optimization revenue, net	$	5,600	$	33,621
Unrealized risk management income (losses)	20,118		(51,188		)
Write-down of inventory	—		(22,281		)
Total	$	25,718	$	(39,848	)