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Schedule II Valuation and qualifying accounts: (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts - Tenant rent receivables
      
Movement in valuation and qualifying accounts      
Balance at beginning of year $ 1,300 $ 1,235 $ 1,600
Additions (Decreases) charged to costs and expenses (13) 85 34
Deductions (1,237) (20) (399)
Balance at end of year 50 1,300 1,235
Allowance for doubtful accounts - Straight-line rent receivable
      
Movement in valuation and qualifying accounts      
Balance at beginning of year 135 135 700
Additions (Decreases) charged to costs and expenses 48 28 2
Deductions (48) (28) (567)
Balance at end of year $ 135 $ 135 $ 135