Earnings (Loss) Per Common Unit

12 Months Ended

Dec. 31, 2012

Earnings (Loss) Per Common Unit

Earnings (Loss) Per Common Unit

22. Earnings (Loss) Per Common Unit

        The following table shows the computation of basic and diluted net (loss) income per common unit, for the years ended December 31, 2012, 2011 and 2010, respectively, and the weighted average units used to compute diluted net (loss) income per common unit (in thousands, except per unit data):

	Year ended December 31,
	2012		2011		2010
Net income attributable to the Partnership's unitholders	$	220,402	$	60,695	$	467
Less: Income allocable to phantom units		2,142		1,749		1,308
Income (loss) available for common unitholders—basic		218,260		58,946		(841	)
Add: Income allocable to phantom units and DER expense(1)		2,183		—		—
Income (loss) available for common unitholders—diluted	$	220,443	$	58,946	$	(841	)
Weighted average common units outstanding—basic		109,979		78,466		70,128
Potential common units (Class B and phantom units)(1)		20,669		153		—
Weighted average common units outstanding—diluted		130,648		78,619		70,128
Net income (loss) attributable to the Partnership's common unitholders per common unit(2)
Basic	$	1.98	$	0.75	$	(0.01	)
Diluted	$	1.69	$	0.75	$	(0.01	)

(1)

In 2012, the use of the if converted method is now more dilutive, therefore income allocable to phantom units and DER expense included in the calculation of diluted earnings per unit and the phantom units are included in the potential common units.

(2)

For the years ended December 31, 2011 and 2010, dilutive instruments include TSR Performance Units and are based on the number of units, if any, that would be issuable at the end of the respective reporting period, assuming that date was the end of the contingency period. For the year ended December 31, 2010, 195 units were excluded from the calculation of diluted units because the impact was anti-dilutive. See Note 19 for further discussion of TSR Performance Units.