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Other Investments - Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2027
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule of Equity Method Investments [Line Items]          
Limited partnership investments   $ 15,805 $ 13,823 $ 15,795 $ 13,449
Equity Method Investment Summarized Financial Information Assets [Roll Forward]          
Limited partnership investments   15,805 13,823 15,795 13,449
Capital contributions   175 245 293 513
Pro-rata share in the net income of limited partnerships   1,010 597 1,242 1,554
Distributions   0 (175) (340) (1,026)
Limited partnership investments   $ 16,990 $ 14,490 $ 16,990 $ 14,490
Scenario, Forecast          
Equity Method Investment Summarized Financial Information Assets [Roll Forward]          
Capital contributions $ 1,900        
Minimum          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage   3.00%   3.00%  
Maximum          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage   5.00%   5.00%