Net Income (Loss) Per Common Share or Common Unit

Basic net income (loss) per common share or Common Unit is computed by dividing net income (loss) attributable to common shareholders or common unitholders, less dividends or distributions on share-based awards expected to vest (referred to as "participating securities" and primarily composed of unvested restricted stock units), by the weighted average number of common shares or Common Units outstanding for the period.

Diluted net income (loss) per common share is computed by dividing the sum of basic net income (loss) attributable to common shareholders and the noncontrolling interest in earnings allocable to Limited Partner Units (to the extent the Limited Partner Units are dilutive) by the sum of the weighted average number of common shares outstanding and, to the extent they are dilutive, Units outstanding and any potential dilutive securities for the period. Diluted net income (loss) per Common Unit is computed by dividing the basic net income (loss) attributable to common unitholders by the sum of the weighted average number of Common Units outstanding and any potential dilutive securities for the period.

The following table reconciles the components of basic and diluted net income (loss) per common share or Common Unit for the three and six months ended June 30, 2013 and 2012, respectively (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
General Partner
Net income (loss) attributable to common shareholders	$	61,494		$	(28,482	)	$	89,537		$	(64,872	)
Less: Dividends on participating securities	(688		)	(856		)	(1,375		)	(1,708		)
Basic net income (loss) attributable to common shareholders	60,806			(29,338		)	88,162			(66,580		)
Noncontrolling interest in earnings of common unitholders	842			—			1,234			—
Diluted net income (loss) attributable to common shareholders	$	61,648		$	(29,338	)	$	89,396		$	(66,580	)
Weighted average number of common shares outstanding	322,489			266,748			318,733			262,556
Weighted average Limited Partner Units outstanding	4,388			—			4,397			—
Other potential dilutive shares	221			—			220			—
Weighted average number of common shares and potential dilutive securities	327,098			266,748			323,350			262,556

Partnership
Net income (loss) attributable to common unitholders	$	62,336		$	(28,948	)	$	90,771		$	(66,149	)
Less: Distributions on participating securities	(688		)	(856		)	(1,375		)	(1,708		)
Basic and diluted net income (loss) attributable to common unitholders	$	61,648		$	(29,804	)	$	89,396		$	(67,857	)
Weighted average number of Common Units outstanding	326,877			271,317			323,130			267,716
Other potential dilutive units	221			—			220			—
Weighted average number of Common Units and potential dilutive securities	327,098			271,317			323,350			267,716

The Limited Partner Units are anti-dilutive to the General Partner for the three and six months ended June 30, 2012 as a result of the net loss for those periods. In addition, substantially all potential shares related to our stock-based compensation plans are anti-dilutive for all periods presented. The following table summarizes the data that is excluded from the computation of net income (loss) per common share or Common Unit as a result of being anti-dilutive (in thousands):



	Three Months Ended June 30,					Six Months Ended June 30,
	2013		2012			2013		2012
General Partner
Noncontrolling interest in loss of common unitholders	$	—	$	(466	)	$	—	$	(1,277	)
Weighted average Limited Partner Units outstanding	—		4,569			—		5,160
General Partner and Partnership
Other potential dilutive shares or units:
Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans	1,373		1,728			1,373		1,728
Outstanding participating securities	3,949		4,047			3,949		4,047