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Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales of investment real estate     $ 0 $ 10,537
Realized gains on sales of investment real estate $ 0 $ 1,213 $ 0 $ 1,213