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Other Investments - Equity Method Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2027
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]            
Investment in certain limited partnerships   $ 14,490 $ 0 $ 13,449 $ 0 $ 15,562
Equity Method Investment Summarized Financial Information Assets [Roll Forward]            
Investment in certain limited partnerships, beginning of period   14,490 0 13,449 0  
Additions from Merger   0 14,153 0 14,153  
Capital Contributions   366 166 878 166  
Equity in net income of limited partnerships   706 0 2,260 0  
Distribution received related to partnerships   0 0 (1,025) 0  
Investment in certain limited partnerships, end of period   $ 15,562 $ 14,319 $ 15,562 $ 14,319  
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%
Maximum            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage           5.00%