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Notes Payable (Other Debt Information Textuals) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 01, 2015
Feb. 28, 2013
Debt Instrument [Line Items]          
Document Period End Date Dec. 31, 2015        
Document Fiscal Year Focus 2015 2014 2013    
Notes payable $ 721,293 $ 792,344      
Mortgage Notes Payable 629,300        
Notes Payable, Fair Value Disclosure 738,100 835,400      
Long Term Debt Nonrecourse          
Debt Instrument [Line Items]          
Carrying value of assets pledged as collateral for debt $ 675,700        
Weighted average maturity of consolidated debt 4 years 6 months        
Line of Credit [Member]          
Debt Instrument [Line Items]          
Notes payable $ 92,000 140,200      
Interest rate on mortgage loan (percent) 1.53%        
Debt Instrument, Maturity Date May 28, 2019        
Post Oak Central Mortgage Note [Member]          
Debt Instrument [Line Items]          
Notes payable $ 181,770 185,109      
Interest rate on mortgage loan (percent) 4.26%        
Promenade mortgage note          
Debt Instrument [Line Items]          
Notes payable $ 108,203 110,946      
Interest rate on mortgage loan (percent) 4.27%        
191 Peachtree Tower mortgage note          
Debt Instrument [Line Items]          
Notes payable $ 100,000 100,000      
Interest rate on mortgage loan (percent) 3.35%        
816 Congress mortgage note          
Debt Instrument [Line Items]          
Notes payable $ 85,000 85,000      
Interest rate on mortgage loan (percent) 3.75%        
Points at Waterview Mortgage Note [Member]          
Debt Instrument [Line Items]          
Notes payable $ 0 $ 14,598   $ 14,200  
Mortgage note maturity date Jan. 01, 2016        
Interest rate on mortgage loan (percent) 5.66%        
Terminus Office Holdings [Member]          
Debt Instrument [Line Items]          
Debt instrument original principal amount         $ 82,000
Equity Method Investment, Ownership Percentage         50.00%
Institutional investors advised by J.P. Morgan Asset Management [Member] | Terminus Office Holdings [Member]          
Debt Instrument [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%