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Other Investments - Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2027
Mar. 31, 2020
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]      
Limited partnership investments   $ 15,795 $ 13,449
Equity Method Investment Summarized Financial Information Assets [Roll Forward]      
Limited partnership investments   15,795 13,449
Capital contributions   118 268
Pro-rata share in the net income of limited partnerships   232 957
Distributions   (340) (851)
Limited partnership investments   $ 15,805 $ 13,823
Scenario, Forecast      
Equity Method Investment Summarized Financial Information Assets [Roll Forward]      
Capital contributions $ 2,100    
Minimum      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   3.00%  
Maximum      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage   5.00%