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Subsequent Events - Additional Information (Details) - USD ($)
3 Months Ended
May 04, 2017
May 03, 2017
Mar. 31, 2017
Mar. 31, 2016
Jan. 12, 2017
Subsequent Event [Line Items]          
Repayment of mortgage loan     $ 873,642,000 $ 354,000  
Waterview [Member]          
Subsequent Event [Line Items]          
Sale agreement amount         $ 460,000,000
Subsequent Event [Member] | Revolving Credit Facility [Member]          
Subsequent Event [Line Items]          
Repayment under credit facility $ 200,000,000        
Subsequent Event [Member] | Waterview [Member]          
Subsequent Event [Line Items]          
Sale agreement amount   $ 460,000,000      
Net proceeds from sale of property   457,000,000      
Gain on sale of property   $ 110,000,000      
Subsequent Event [Member] | 1899 Pennsylvania Avenue [Member] | Mortgages and Notes Payable with Fixed Rate [Member]          
Subsequent Event [Line Items]          
Repayment of mortgage loan 87,179,000        
Subsequent Event [Member] | Liberty Place [Member] | Mortgages and Notes Payable with Fixed Rate [Member]          
Subsequent Event [Line Items]          
Repayment of mortgage loan $ 84,000,000