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SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
reportable_segments
Mar. 31, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Number of Reportable Segments (in segments) 5    
Revenues $ 39,626 $ 37,447  
Property operating expenses and real estate taxes 12,898 11,559  
General and administrative 5,933 5,690  
Income before depreciation and amortization and interest and other finance expense 20,795 20,198  
Depreciation and amortization (9,141) (7,634)  
Interest and other finance expense (8,634) (8,953)  
Real estate at cost 1,565,646 1,318,907  
Total assets 1,726,736 1,531,741 1,653,319
Expenditures for redevelopment and improvements 20,081 13,225  
Acquisition of real estate 48,689 0  
Other interest income 54 34  
Equity in earnings (losses) of unconsolidated affiliates (56) (148)  
Income tax provision 195 262  
Gain on debt extinguishment 0 1,673  
Income from discontinued operations 0 822  
Gain on sale of property 0 3,922  
Net income 2,823 9,652  
Net (income) loss attributable to noncontrolling interests 1,187 (229)  
Net income attributable to Common Shareholders 4,010 9,423  
Core Portfolio [Member]
      
Segment Reporting Information [Line Items]      
Revenues 15,276 14,432  
Property operating expenses and real estate taxes 4,532 4,293  
General and administrative 6,361 5,898  
Income before depreciation and amortization and interest and other finance expense 4,383 4,241  
Depreciation and amortization 3,747 3,258  
Interest and other finance expense 3,354 4,204  
Real estate at cost 548,075 441,203  
Total assets 661,545 561,728  
Expenditures for redevelopment and improvements 7,204 1,385  
Acquisition of real estate 16,189    
Opportunity Funds [Member]
      
Segment Reporting Information [Line Items]      
Revenues 15,767 12,526  
Property operating expenses and real estate taxes 5,775 4,507  
General and administrative 3,246 3,480  
Income before depreciation and amortization and interest and other finance expense 6,746 4,539  
Depreciation and amortization 4,504 3,536  
Interest and other finance expense 4,199 3,813  
Real estate at cost 818,981 680,880  
Total assets 936,787 790,439  
Expenditures for redevelopment and improvements 12,742 11,670  
Acquisition of real estate 32,500    
Self Storage Investments [Member]
      
Segment Reporting Information [Line Items]      
Revenues 6,096 5,335  
Property operating expenses and real estate taxes 3,375 3,204  
General and administrative 0 0  
Income before depreciation and amortization and interest and other finance expense 2,721 2,131  
Depreciation and amortization 1,114 948  
Interest and other finance expense 872 967  
Real estate at cost 214,567 210,447  
Total assets 191,882 193,505  
Expenditures for redevelopment and improvements 839 445  
Acquisition of real estate 0    
Notes Receivable [Member]
      
Segment Reporting Information [Line Items]      
Revenues 2,055 4,538  
Property operating expenses and real estate taxes 0 0  
General and administrative 0 0  
Income before depreciation and amortization and interest and other finance expense 2,055 4,538  
Depreciation and amortization 0 0  
Interest and other finance expense 0 0  
Real estate at cost 0 0  
Total assets 77,180 92,417  
Expenditures for redevelopment and improvements 0 0  
Acquisition of real estate 0    
Other [Member]
      
Segment Reporting Information [Line Items]      
Revenues 5,659 6,474  
Property operating expenses and real estate taxes 0 0  
General and administrative 0 0  
Income before depreciation and amortization and interest and other finance expense 5,659 6,474  
Depreciation and amortization 0 0  
Interest and other finance expense 0 0  
Real estate at cost 0 0  
Total assets 0 0  
Expenditures for redevelopment and improvements 0 0  
Acquisition of real estate 0    
Amounts Eliminated in Consolidation [Member]
      
Segment Reporting Information [Line Items]      
Revenues (5,227) (5,858)  
Property operating expenses and real estate taxes (784) (445)  
General and administrative (3,674) (3,688)  
Income before depreciation and amortization and interest and other finance expense (769) (1,725)  
Depreciation and amortization (224) (108)  
Interest and other finance expense 209 (31)  
Real estate at cost (15,977) (13,623)  
Total assets (140,658) (106,348)  
Expenditures for redevelopment and improvements (704) (275)  
Acquisition of real estate $ 0