Annual report pursuant to Section 13 and 15(d)

Acquisition of Rental Property Schedule of Consideration Transferred (Details)

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Acquisition of Rental Property Schedule of Consideration Transferred (Details) (Business Acquisitions, Combined [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Schedule of Consideration Transferred [Line Items]  
Land $ 6,425
Less: contingent consideration (3,023)
Less: noncontrolling interests (6,845)
Buildings, improvements and fixtures 298,147
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets 93,463
Mortgage fair value adjustments (7,081)
Net assets acquired 390,954
Consideration transferred 381,086
Leases, Acquired-in-Place, Market Adjustment [Member]
  
Schedule of Consideration Transferred [Line Items]  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets 5,166
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years 0 months 26 days
Ground Leases, Market Adjustment [Member]
  
Schedule of Consideration Transferred [Line Items]  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets 31,993
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 87 years 6 months 22 days
Leases, Acquired-in-Place [Member]
  
Schedule of Consideration Transferred [Line Items]  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets 24,232
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years 0 months 11 days
Tenant Relationships [Member]
  
Schedule of Consideration Transferred [Line Items]  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets 28,628
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years 1 month 28 days
Lease and Legal Costs [Member]
  
Schedule of Consideration Transferred [Line Items]  
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets $ 3,444
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 2 months 19 days