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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Properties
Jun. 30, 2011
Jun. 30, 2012
Properties
Jun. 30, 2011
Dec. 31, 2011
Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
properties held for sale 11   11    
Liabilities of Assets Held-for-sale $ 878   $ 878   $ 0
Revenue:          
Rents 115,032 114,995 229,271 230,328  
Tenant Reimbursements 18,605 18,237 37,613 40,177  
Gain (Loss) on Contract Termination 101 1,948 1,591 2,516  
Other 966 1,336 2,498 2,359  
Total revenue 137,576 139,249 276,987 280,866  
Expenses:          
Property operating expenses 37,906 39,115 77,363 83,235  
Real estate taxes 14,134 13,786 28,228 27,495  
Depreciation and amortization 49,331 55,710 98,880 105,214  
Total operating expenses 108,714 116,007 219,114 231,094  
Investment Income, Interest 1,841 421 2,324 862  
Income from discontinued operations before gain on sale of interests in real estate 783 1,743 1,798 3,579  
Net gain on disposition of discontinued operations 10,166 3,836 24,834 3,836  
Income from discontinued operations 10,949 5,579 26,632 7,415  
Number of properties sold (in properties)         2
Assets Held-for-sale [Member]
          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets Held-for-sale, Long Lived 52,990   52,990    
Real Estate Investment Property, Accumulated Depreciation (14,385)   (14,385)    
Operating Real Estate Investment Properties Held for Sale, Net 38,605   38,605    
Development in Process 36   36    
Real Estate Investment Property, Net 38,641   38,641    
Accounts Receivable, Net 1,374   1,374    
Deferred Costs Related to Properties Held-for-Sale 1,137   1,137    
Other Assets Related to Assets Held-for-Sale 298   298    
Assets Held-for-sale, Current 41,450   41,450    
Liabilities of Assets Held-for-sale 878   878    
Discontinued Operations [Member]
          
Revenue:          
Rents 2,003 5,620 6,113 11,292  
Tenant Reimbursements 343 750 758 1,931  
Gain (Loss) on Contract Termination 0   7    
Other 86 5 89 2  
Total revenue 2,432 6,375 6,967 13,225  
Expenses:          
Property operating expenses 594 1,581 1,701 3,639  
Real estate taxes 217 707 726 1,446  
Depreciation and amortization 840 2,344 2,744 4,561  
Total operating expenses 1,651 4,632 5,171 9,646  
Investment Income, Interest 2   2    
Income from discontinued operations before gain on sale of interests in real estate 783 1,743 1,798 3,579  
Net gain on disposition of discontinued operations 10,166 3,836 24,834 3,836  
Income from discontinued operations $ 10,949 $ 5,579 $ 26,632 $ 7,415  
Number of properties sold (in properties)     3 7