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Investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]          
Assets held for sale $ 7,053   $ 7,053   $ 0
Proceeds from sales of investment real estate     2,591 $ 0  
Realized gains on sales of investment real estate $ 0 $ 0 $ 401 $ 0