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Reportable Segments Table (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Fee Income $ 2,199 $ 1,816
Other Revenue from Continuing Operations 576 127
Net operating property income, including discontinued operations 59,513 58,053
Rental Property Net Operating Income from Discontinued Operations   14
Net operating income in joint venture 6,646 (5,988)
General and Administrative Expense (8,492) (3,595)
Interest Expense (7,414) (7,677)
Depreciation, Depletion and Amortization (31,969) (36,147)
Other Expenses (125) (440)
Reimbursed Expenses (870) (1,111)
Income (Loss) from Equity Method Investments 1,834 1,611
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes 0 (565)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 14,190 1,105
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 22,796 7,203
Houston [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 25,318 25,078
Atlanta [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 24,199 24,715
Austin [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 5,192 2,186
Charlotte [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 4,774 3,943
Other [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 30 2,131
Mixed-Use [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 1,601 1,352
Mixed-Use [Member] | Houston [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Mixed-Use [Member] | Atlanta [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 1,601 1,352
Mixed-Use [Member] | Austin [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Mixed-Use [Member] | Charlotte [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Mixed-Use [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Office Segment [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 57,894 56,745
Office Segment [Member] | Houston [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 25,318 25,078
Office Segment [Member] | Atlanta [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 22,598 23,363
Office Segment [Member] | Austin [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 5,192 2,186
Office Segment [Member] | Charlotte [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 4,774 3,943
Office Segment [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 12 2,175
Other [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 18 (44)
Other [Member] | Houston [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Other [Member] | Atlanta [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Other [Member] | Austin [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Other [Member] | Charlotte [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations 0 0
Other [Member] | Other [Member]    
Segment Reporting Information [Line Items]    
Net operating property income, including discontinued operations $ 18 $ (44)