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Investment in Office Properties - 2016 Dispositions (Details)
$ in Thousands
3 Months Ended
Feb. 05, 2016
USD ($)
property
Mar. 31, 2016
USD ($)
Jan. 22, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross asset value of disposal assets   $ 0   $ 21,373
Liabilities related to assets held for sale   0   1,003
Houston, TX | 5300 Memorial | Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross sale price     $ 33,000  
Gain (loss) in continuing operations   20,500    
Gross asset value of disposal assets       12,000
Liabilities related to assets held for sale       398
Houston, TX | Town & Country | Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross sale price     $ 27,000  
Gain (loss) in continuing operations   $ 17,300    
Gross asset value of disposal assets       9,400
Liabilities related to assets held for sale       $ 605
Miami, Florida | Courvoisier Centre | Office Building | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross sale price $ 175,000      
Gain (loss) in continuing operations $ 25,300      
Percentage of interest sold 80.00%      
Number of real estate properties sold | property 2      
Proceeds from sale of real estate $ 154,300      
Ownership interest percentage in the property after disposal 20.00%      
Courvoisier Joint Venture | First Mortgage | Office Building        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Mortgage secured for properties $ 106,500      
Fixed interest rate on mortgage loans on real estate (as a percent) 4.60%