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Significant Accounting Policies (Details 6) (USD $)
Share data in Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Deferred Leasing Commissions                      
Amortization of deferred leasing commissions                 $ 4,173,000 $ 3,806,000 $ 2,867,000
Estimated annual amortization of deferred leasing commissions for the succeeding five years                      
2013                 4,080,000    
2014                 3,967,000    
2015                 3,571,000    
2016                 3,171,000    
2017                 2,286,000    
2018 and thereafter                 6,301,000    
Summary of rental revenue                      
Income from leases                 117,462,000 98,308,000 86,320,000
Reimbursable expenses                 29,847,000 26,006,000 24,505,000
Straight-line rent adjustment                 4,418,000 9,877,000 3,940,000
Amortization of favorable and unfavorable leases                 (71,000) 47,000 (1,491,000)
Rental revenue                 $ 151,656,000 $ 134,238,000 $ 113,274,000
Segment Reporting                      
Number of reporting segments                 1    
Net Income Per Share                      
Denominator used for calculating basic and diluted net income per share (in shares) 82,937 82,937 82,937 82,937 82,937 81,600 81,437 81,437 82,937 81,857 79,826