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Investment in Real Estate - Schedule of Dispositions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(Loss) income from discontinued operations $ 0 $ (164) $ 1,571
City Plaza      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total office revenues 0 0 4,321
Office operating expenses 0 (164) (1,961)
Depreciation and amortization 0 0 (789)
(Loss) income from discontinued operations $ 0 $ (164) $ 1,571