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Quarterly Financial Data (Unaudited):
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Data (Unaudited):  
Quarterly Financial Data (Unaudited):

24. Quarterly Financial Data (Unaudited):

        The following is a summary of quarterly results of operations for the years ended December 31, 2011 and 2010:

 
   2011 Quarter Ended   2010 Quarter Ended  
 
   Dec 31   Sep 30   Jun 30   Mar 31   Dec 31   Sep 30   Jun 30   Mar 31  

Revenues(1)

   $ 215,315   $ 202,683   $ 190,940   $ 191,069   $ 200,334   $ 189,471   $ 181,226   $ 182,114  

Net income (loss) available to common stockholders(2)

  
$
163,107		  
$
12,941		  
$
(19,216
)
$
34		  
$
23,558		  
$
8,429		  
$
(440
)
$
(6,357
)

Net income (loss) available to common stockholders per share-basic

  
$
1.23		  
$
0.10		  
$
(0.15
)
$
—		  
$
0.18		  
$
0.06		  
$
(0.01
)
$
(0.08
)

Net income (loss) available to common stockholders per share-diluted

  
$
1.23		  
$
0.10		  
$
(0.15
)
$
—		  
$
0.18		  
$
0.06		  
$
(0.01
)
$
(0.08
)
(1)
Revenues as reported on the Company's Quarterly Reports on Form 10-Q have been reclassified to reflect adjustments for discontinued operations.

(2)
Net income available to common stockholders for the quarter ended December 31, 2011 includes a gain of $188,264 from the SDG Transaction (See Note 4—Investments in Unconsolidated Joint Ventures) and an impairment loss of $45,458 related to the reduction of the expected holding period of certain long-lived assets (See Note 6—Property).