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Investment in Office Properties - 2016 Dispositions (Details)
$ in Thousands
3 Months Ended
Feb. 05, 2016
USD ($)
property
Mar. 31, 2016
USD ($)
Jun. 30, 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     $ 21,448   $ 21,373
Liabilities related to assets held for sale     $ 11,677   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
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%