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Financial Instruments and Fair Value Measurements - Schedule of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Feb. 29, 2020
Derivatives, Fair Value [Line Items]      
Fair value, liability derivatives $ (60,979) $ (90,139)  
Derivative Assets 1 1  
Interest Rate Swaps      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount   30,400 $ 50,000
Core Portfolio      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount 539,898    
Fair value, derivatives, net (51,255) (74,990)  
Core Portfolio | Interest Rate Swaps | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount 539,898    
Fair value, liability derivatives $ 51,255 74,990  
Core Portfolio | Interest Rate Swaps | Minimum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2012-12    
Derivative Maturity Date 2022-03    
Strike Rate 1.71%    
Core Portfolio | Interest Rate Swaps | Maximum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2020-07    
Derivative Maturity Date 2030-07    
Strike Rate 3.77%    
Fund Portfolio | Fund II      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 63,661    
Fair value, derivatives, net (89) (219)  
Fund Portfolio | Fund II | Interest Rate Swaps | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 18,661    
Derivative Effective Date 2014-10    
Derivative Maturity Date 2021-11    
Fair value, liability derivatives $ 89 219  
Fund Portfolio | Fund II | Interest Rate Swaps | Minimum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Strike Rate 2.88%    
Fund Portfolio | Fund II | Interest Rate Swaps | Maximum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Strike Rate 2.88%    
Fund Portfolio | Fund II | Interest Rate Caps | Other Assets      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 45,000    
Derivative Effective Date 2019-03    
Derivative Maturity Date 2022-03    
Derivative Assets $ 0 0  
Fund Portfolio | Fund II | Interest Rate Caps | Minimum | Other Assets      
Derivatives, Fair Value [Line Items]      
Strike Rate 3.50%    
Fund Portfolio | Fund II | Interest Rate Caps | Maximum | Other Assets      
Derivatives, Fair Value [Line Items]      
Strike Rate 3.50%    
Fund Portfolio | Fund III | Interest Rate Caps | Other Assets      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 35,970    
Derivative Effective Date 2021-01    
Derivative Maturity Date 2022-07    
Derivative Assets $ 0 0  
Fund Portfolio | Fund III | Interest Rate Caps | Minimum | Other Assets      
Derivatives, Fair Value [Line Items]      
Strike Rate 3.00%    
Fund Portfolio | Fund III | Interest Rate Caps | Maximum | Other Assets      
Derivatives, Fair Value [Line Items]      
Strike Rate 3.00%    
Fund Portfolio | Fund IV      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 119,949    
Fair value, derivatives, net (720) (1,712)  
Fund Portfolio | Fund IV | Interest Rate Swaps | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount 42,549    
Fair value, liability derivatives $ 721 1,713  
Fund Portfolio | Fund IV | Interest Rate Swaps | Minimum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2017-03    
Derivative Maturity Date 2022-04    
Strike Rate 1.48%    
Fund Portfolio | Fund IV | Interest Rate Swaps | Maximum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2019-12    
Derivative Maturity Date 2022-12    
Strike Rate 4.00%    
Fund Portfolio | Fund IV | Interest Rate Caps | Other Assets      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 77,400    
Derivative Assets $ 1 1  
Fund Portfolio | Fund IV | Interest Rate Caps | Minimum | Other Assets      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2019-07    
Derivative Maturity Date 2021-07    
Strike Rate 3.00%    
Fund Portfolio | Fund IV | Interest Rate Caps | Maximum | Other Assets      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2020-12    
Derivative Maturity Date 2022-12    
Strike Rate 3.50%    
Fund Portfolio | Fund V      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount $ 304,843    
Fair value, derivatives, net (8,914) (13,217)  
Fund Portfolio | Fund V | Interest Rate Swaps | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Aggregate Notional Amount 304,843    
Fair value, liability derivatives $ 8,914 $ 13,217  
Fund Portfolio | Fund V | Interest Rate Swaps | Minimum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2018-06    
Derivative Maturity Date 2022-02    
Strike Rate 0.23%    
Fund Portfolio | Fund V | Interest Rate Swaps | Maximum | Other Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Effective Date 2021-02    
Derivative Maturity Date 2024-10    
Strike Rate 2.88%