Annual report pursuant to Section 13 and 15(d)

Investment In Joint Ventures (Cash Flows Arising From Off Balance Sheet Arrangements) (Details)

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Investment In Joint Ventures (Cash Flows Arising From Off Balance Sheet Arrangements) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Equity Method Investments [Line Items]      
Other operating income (management fees and acquisition fee income) $ 12,935,000 $ 9,207,000 $ 7,966,000
General and administrative expenses (corporate office rent) 25,986,000 21,071,000 18,649,000
Equity in (losses) income of joint ventures (340,000) 240,000 235,000
Distributions from unconsolidated joint venture 944,000 494,000 686,000
Investment in joint ventures 13,571,000   331,000
(Advances) reimbursement of advances to joint ventures (413,000) (80,000) 163,000
Sovran HHF, Sovran HHF II And Iskalo Office Holdings, LLC [Member]
     
Schedule of Equity Method Investments [Line Items]      
Other operating income (management fees and acquisition fee income) 2,578,000 1,260,000 1,243,000
General and administrative expenses (corporate office rent) 688,000 644,000 608,000
Equity in (losses) income of joint ventures (340,000) 241,000 235,000
Distributions from unconsolidated joint venture 944,000 494,000 686,000
Investment in joint ventures (13,571,000)   (331,000)
(Advances) reimbursement of advances to joint ventures $ (413,000) $ (80,000) $ 163,000