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Investments - Allowance for Credit Loss on Beneficial Interests (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for beneficial interests credit losses, beginning balance $ (5,530) $ (7,208) $ (4,453) $ 0
Incremental change in allowance for beneficial interests 2,388 0 1,435 0
Increase in allowance for beneficial interest credit losses for acquisitions (1,593) 0 (1,593) (2,553)
Credit loss expense on beneficial interests (216) (260) (355) (429)
Reclassification from non-credit discount to the allowance for losses for increases in the net present value of expected cash flows 0 (2,553) 0 (2,553)
Net reversal of provision for credit losses due to increases in actual and/or forecasted cash flows 1,992 3,062 2,007 244
Allowance for beneficial interests credit losses, end balance (2,959) (6,959) (2,959) (6,959)
Beginning period adjustment for CECL adoption        
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]        
Allowance for beneficial interests credit losses, beginning balance $ 0 $ 0 $ 0 $ (1,668)