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Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
2011
 
3/31/2011
 
6/30/2011
 
9/30/2011
 
12/31/2011
Total gross revenues(1)
$
78,302

 
$
78,468

 
$
80,466

 
$
80,988

Net income (loss)
$
(15,993
)
 
$
(56,957
)
 
$
(30,844
)
 
$
14,016

Net income (loss) attributable to common shareholders
$
(23,638
)
 
$
(50,539
)
 
$
(37,048
)
 
$
7,504

Net income (loss) attributable to common shareholders - basic per share
$
(0.16
)
 
$
(0.33
)
 
$
(0.24
)
 
$
0.05

Net income (loss) attributable to common shareholders - diluted per share
$
(0.21
)
 
$
(0.33
)
 
$
(0.24
)
 
$
0.05

 
2010
 
3/31/2010
 
6/30/2010
 
9/30/2010
 
12/31/2010
Total gross revenues(1)
$
76,938

 
$
76,432

 
$
78,393

 
$
77,619

Net income (loss)
$
(29,326
)
 
$
(29,701
)
 
$
7,340

 
$
14,277

Net income (loss) attributable to common shareholders
$
(33,048
)
 
$
(30,379
)
 
$
58

 
$
5,273

Net income (loss) attributable to common shareholders - basic and diluted
per share
$
(0.27
)
 
$
(0.23
)
 
$
0.00

 
$
0.04

__________
(1) All periods have been adjusted to reflect the impact of properties sold during the six months ended June 30, 2012 and the years ended December 31, 2011 and 2010, and properties classified as held for sale, which are reflected in discontinued operations in the Consolidated Statements of Operations.