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Schedule II Valuation and qualifying accounts (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts - Tenant rent receivables
      
Movement in valuation and qualifying accounts      
Balance at beginning of year $ 1,235,000 $ 1,600,000 $ 620,000
Additions (Decreases) charged to costs and expenses 85,000 34,000 1,175,000
Deductions (20,000) (399,000) (195,000)
Balance at end of year 1,300,000 1,235,000 1,600,000
Allowance for doubtful accounts - Straight-line rent receivable
      
Movement in valuation and qualifying accounts      
Balance at beginning of year 135,000 700,000 100,000
Additions (Decreases) charged to costs and expenses 28,000 2,000 600,000
Deductions (28,000) (567,000)  
Balance at end of year $ 135,000 $ 135,000 $ 700,000