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Accounting for the Impairment or Disposal of Long-Lived Assets (Tables)
 12 Months Ended
Dec. 31, 2011
Results of Operations for the Properties Held for Sale and Disposed
 
For the Year Ended
 
December 31, 2011
 
December 31, 2010
 
December 31, 2009
Revenues
$
58,145

 
$
93,456

 
$
115,486

Operating expenses
(25,694
)
 
(38,313
)
 
(41,882
)
Interest expense
(9,028
)
 
(15,320
)
 
(17,767
)
Depreciation and amortization
(13,166
)
 
(23,307
)
 
(25,230
)
Income before property dispositions
10,257

 
16,516

 
30,607

Gain on property dispositions
60,582

 
6,857

 
17,859

Net income
$
70,839

 
$
23,373

 
$
48,466