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Investments - Available-for-sale (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Investment in debt securities - Basis $ 261,926 $ 230,408
Investment in debt securities - Gross unrealized gains 2,936 1,643
Investment in debt securities - Gross unrealized loss (6,872) (366)
Investment in debt securities 257,990 231,685
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest    
Debt Securities, Available-for-sale [Line Items]    
Investment in beneficial interests - Basis 331,802 288,362
Investment in beneficial interests - Gross unrealized gains 2,936 1,643
Investment in beneficial interests - Gross unrealized loss (6,872) (366)
Investment in beneficial interests 327,866 289,639
Beneficial interests    
Debt Securities, Available-for-sale [Line Items]    
Investment in beneficial interests - Basis 69,876 57,954
Investment in beneficial interests - Gross unrealized gains 0 0
Investment in beneficial interests - Gross unrealized loss 0 0
Investment in beneficial interests $ 69,876 $ 57,954