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Notes Payable (Other Mortgage Loan Information) (Details)
ft² in Thousands
3 Months Ended 12 Months Ended
Dec. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Non-recourse mortgage loan   $ 127,500,000.0  
Mortgage Debt      
Debt Instrument [Line Items]      
Debt assumed that was repaid $ 251,900,000    
Colorado Tower      
Debt Instrument [Line Items]      
Non-recourse mortgage loan   $ 120,000,000  
Square footage of real estate property (square feet) | ft²   373  
Interest rate on mortgage loan (percent)   3.45%  
Fifth Third Center      
Debt Instrument [Line Items]      
Non-recourse mortgage loan   $ 150,000,000  
Square footage of real estate property (square feet) | ft²   698  
Interest rate on mortgage loan (percent)   3.37%  
191 Peachtree Tower      
Debt Instrument [Line Items]      
Interest rate on mortgage loan (percent)     3.35%
Notes payable prepayment penalty   $ 3,700,000  
191 Peachtree Tower | Mortgage Debt      
Debt Instrument [Line Items]      
Debt assumed that was repaid   $ 98,100,000  
The Points at Waterview      
Debt Instrument [Line Items]      
Debt assumed that was repaid     $ 14,200,000