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DISCONTINUED OPERATIONS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
property
Mar. 31, 2012
Dec. 31, 2012
property
DISCONTINUED OPERATIONS      
Number of properties sold related to discontinued operations 5   26
REVENUES      
Rental income $ 69,618 $ 57,317  
Other property related income 7,694 5,775  
Total revenues 78,457 64,112  
OPERATING EXPENSES      
Property operating expenses 30,821 25,943  
Depreciation and amortization 29,832 25,083  
Total operating expenses 68,266 57,470  
OPERATING INCOME 10,191 6,642  
Income from discontinued operations 184 1,065  
Gain on disposition of discontinued operations 228    
Total discontinued operations 412 1,065  
Discontinued operations
      
REVENUES      
Rental income 389 2,790  
Other property related income 73 297  
Total revenues 462 3,087  
OPERATING EXPENSES      
Property operating expenses 221 1,342  
Depreciation and amortization 57 680  
Total operating expenses 278 2,022  
OPERATING INCOME 184 1,065  
Income from discontinued operations 184 1,065  
Gain on disposition of discontinued operations 228    
Total discontinued operations $ 412 $ 1,065