Loss Per Common Share / Unit

12 Months Ended

Dec. 31, 2012

Loss Per Common Share / Unit

18. Loss Per Common Share / Unit

We determine basic earnings per share/unit based on the weighted average number of shares of common stock/units outstanding during the period. We compute diluted earnings per share/unit based on the weighted average number of shares outstanding combined with the incremental weighted average effect from all outstanding potentially dilutive instruments.

The following table sets forth the computation of our basic and diluted earnings per share/unit for the years ended December 31 (in thousands, except per share/unit amounts):

REIT	2012 (1)		2011 (1)		2010 (1)
Net loss attributable to common stockholders	$	(80,946)	$	(188,110)	$	(1,295,920)
Weighted average common shares outstanding - Basic and Diluted (2)(3)(4)		459,895		370,534		219,515
Net loss per share attributable to common stockholders - Basic and Diluted	$	(0.18)	$	(0.51)	$	(5.90)
Operating Partnership
Net loss attributable to common unitholders	$	(81,108)	$	(188,459)	$	(1,295,920)
Weighted average common partnership units outstanding - Basic and Diluted (2)(3)(4)		461,848		371,730		219,515
Net loss per unit attributable to common unitholders - Basic and Diluted	$	(0.18)	$	(0.51)	$	(5.90)

(1) In periods with a net loss, the inclusion of any incremental shares/units is anti-dilutive, and therefore, both basic and diluted shares/units are the same.

(2) The increase in shares/units between the periods is due to the Merger (see Note 3 for more details) and an equity offering in June 2011.

(3) Total weighted average potentially dilutive share awards and warrants outstanding (in thousands) for the years ended December 31, 2012, 2011 and 2010 were 9,805, 7,648 and 4,498, respectively.

(4) The shares underlying the exchangeable debt have not been included because the impact would be anti-dilutive.