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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Valuation and qualifying accounts      
Balance at beginning of period $ 2,339,000 $ 2,440,000 $ 2,454,000
(Recovered) charged to costs and expenses 2,180,000 (101,000) (14,000)
Deductions (1,307,000)    
Balance at end of period 3,212,000 2,339,000 2,440,000
Allowance for doubtful accounts and other receivables
      
Valuation and qualifying accounts      
Balance at beginning of period 782,000 921,000 981,000
(Recovered) charged to costs and expenses 1,274,000 (139,000) (60,000)
Deductions (385,000)    
Balance at end of period 1,671,000 782,000 921,000
Straight-line rent receivable allowance
      
Valuation and qualifying accounts      
Balance at beginning of period 1,557,000 1,519,000 1,473,000
(Recovered) charged to costs and expenses 906,000 38,000 46,000
Deductions (922,000)    
Balance at end of period 1,541,000 1,557,000 1,519,000
Write-off of straight-line rent receivable balance $ 878,000