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Schedule II Valuation and qualifying accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance for doubtful accounts - Tenant rent receivables
      
Movement in valuation and qualifying accounts      
Balance at beginning of year $ 1,600 $ 620 $ 509
Additions (Decreases) charged to costs and expenses 34 1,175 131
Deductions (399) (195) (20)
Balance at end of year 1,235 1,600 620
Allowance for doubtful accounts - Straight-line rent receivable
      
Movement in valuation and qualifying accounts      
Balance at beginning of year 700 100 261
Additions (Decreases) charged to costs and expenses 2 600 (62)
Deductions (567)   (99)
Balance at end of year $ 135 $ 700 $ 100