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Significant Accounting Policies (Details 6) (USD $)
Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
segment
Dec. 31, 2010
Dec. 31, 2009
Deferred Leasing Commissions      
Amortization of deferred leasing commissions $ 3,806,000 $ 2,867,000 $ 2,665,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years      
2012 3,928,000    
2013 3,590,000    
2014 3,263,000    
2015 2,800,000    
2016 2,451,000    
2017 and thereafter 6,609,000    
Summary of rental revenue      
Income from leases 99,336,000 87,667,000 93,870,000
Reimbursable expenses 26,108,000 24,549,000 27,084,000
Straight-line rent adjustment 9,900,000 3,913,000 1,778,000
Amortization of favorable and unfavorable leases 47,000 (1,491,000) (3,391,000)
Rental revenue $ 135,391,000 $ 114,638,000 $ 119,341,000
Segment Reporting      
Number of reporting segments 1    
Net Income Per Share      
Denominator used for calculating basic and diluted net income per share (in shares) 81,857 79,826 73,001