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Debt - Mortgage Payable - Additional Information (Details)
3 Months Ended 12 Months Ended
Nov. 09, 2017
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
property
loan
Dec. 31, 2018
USD ($)
property
loan
derivative
Dec. 31, 2012
USD ($)
Debt Instrument [Line Items]          
Amount drawn on loan     $ 1,170,076,000 $ 1,017,288,000  
Loan amount drew down     60,800,000 0  
Interest Rate Swaps          
Debt Instrument [Line Items]          
Derivative, notional amount     156,000,000.0    
Mortgages          
Debt Instrument [Line Items]          
Borrowings, amount     258,900,000    
Scheduled principal payment     5,900,000    
Amount drawn on loan     $ 1,170,076,000 $ 1,017,288,000  
Number of properties collateralized | property     44 43  
Mortgages | Interest Rate Swaps          
Debt Instrument [Line Items]          
Derivative, notional amount       $ 136,600,000  
Number of interest rate derivatives held | derivative       4  
Derivative fixed interest rate       2.86%  
Mortgages | Maturing from May 2019 to January 2021          
Debt Instrument [Line Items]          
Number of mortgage loans | loan     3    
Borrowings, amount     $ 69,000,000.0    
Mortgages | Maturing from April 2022 though December 2024.          
Debt Instrument [Line Items]          
Borrowings, amount     $ 71,800,000    
Mortgages | Maturities Ranging from November 2019 through January 2020          
Debt Instrument [Line Items]          
Number of mortgage loans | loan     3    
Borrowings, amount     $ 135,900,000    
Mortgages | Maturing Ranging from December 2020 though May 2021          
Debt Instrument [Line Items]          
Borrowings, amount     125,300,000    
Mortgages | Interest Rate Swaps          
Debt Instrument [Line Items]          
Derivative, notional amount     $ 283,600,000    
Derivative weighted average interest rate     1.78%    
Fund II | New Market Tax Credit          
Debt Instrument [Line Items]          
Income recognized from tax credit transactions   $ 5,000,000.0      
Percentage of tax credits on qualifying invested equity loans   39.00%      
Transfer of tax credit transactions to investors exchange amount         $ 5,200,000
Redemption of loan expiration period     7 years    
Fund II | New Market Tax Credit | Other Income          
Debt Instrument [Line Items]          
Income recognized from tax credit transactions     $ 1,400,000    
Fund II | City Point Project | New Market Tax Credit          
Debt Instrument [Line Items]          
Income recognized from tax credit transactions   $ 5,000,000.0      
Fund II | Mortgages          
Debt Instrument [Line Items]          
Number of mortgage loans | loan     1    
Fund V | Mortgages          
Debt Instrument [Line Items]          
Number of mortgage loans | loan     5 4  
Borrowings, amount       $ 109,500,000  
Fund IV | Mortgages          
Debt Instrument [Line Items]          
Number of mortgage loans | loan     3    
Repayments of debt     $ 38,200,000    
Number of notes repaid | loan       3  
Fund IV | Mortgages One          
Debt Instrument [Line Items]          
Repayments of debt       $ 27,200,000  
Fund IV | Mortgages Two          
Debt Instrument [Line Items]          
Repayments of debt     18,400,000    
Fund III | Mortgages          
Debt Instrument [Line Items]          
Repayments of debt     4,700,000    
Fund III | Mortgages One          
Debt Instrument [Line Items]          
Repayments of debt     9,800,000    
Fund III | Construction Loans          
Debt Instrument [Line Items]          
Loan amount drew down       24,600,000  
Core Portfolio          
Debt Instrument [Line Items]          
Derivative, notional amount     562,560,000    
Core Portfolio | Maturing In 2028          
Debt Instrument [Line Items]          
Amount drawn on loan       50,000,000.0  
Core Portfolio | Mortgages          
Debt Instrument [Line Items]          
Repayments of debt       40,400,000  
Scheduled principal payment       $ 6,700,000  
Number of notes repaid | loan       1  
Core Portfolio | Mortgages | Brandywine Portfolio          
Debt Instrument [Line Items]          
Debt default, amount     $ 26,300,000 $ 26,300,000  
Debt instrument, maturity date     Jul. 01, 2016    
Interest rate, stated percentage     6.00%    
Debt default interest     5.00%    
Claim amount exclusive of accruing interest, default interest, fees and costs $ 33,000,000.0        
Core Portfolio | Mortgages | Maturing In 2028          
Debt Instrument [Line Items]          
Borrowings, amount       $ 73,500,000  
LIBOR | Interest Rate Swaps          
Debt Instrument [Line Items]          
Derivative weighted average interest rate     2.43%    
LIBOR | Mortgages          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.70%    
LIBOR | Mortgages | Maturing from May 2019 to January 2021          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.08%    
LIBOR | Mortgages | Maturing from April 2022 though December 2024.          
Debt Instrument [Line Items]          
Basis spread on variable rate     1.86%    
LIBOR | Mortgages | Maturities Ranging from November 2019 through January 2020          
Debt Instrument [Line Items]          
Basis spread on variable rate     3.65%    
LIBOR | Mortgages | Maturing Ranging from December 2020 though May 2021          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.96%    
LIBOR | Fund V | Mortgages          
Debt Instrument [Line Items]          
Basis spread on variable rate       1.99%  
LIBOR | Fund IV | Mortgages          
Debt Instrument [Line Items]          
Basis spread on variable rate     2.35%    
LIBOR | Fund IV | Mortgages One          
Debt Instrument [Line Items]          
Basis spread on variable rate       2.81%  
LIBOR | Fund III | Mortgages          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.50%    
LIBOR | Core Portfolio | Mortgages          
Debt Instrument [Line Items]          
Basis spread on variable rate       1.65%  
LIBOR | Core Portfolio | Mortgages | Maturing In 2028          
Debt Instrument [Line Items]          
Basis spread on variable rate       1.50%