Fair Value Measurements - Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fixed income
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 0	$ 0	$ 0	$ 13
Purchases	0	0	0	0
Sales	0	0	0	(13)
Included in earnings and reported as losses incurred, net	0	0	0	0
Balance at end of period	0	0	0	0
Real Estate Acquired
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1,963	10,250	7,252	14,535
Purchases	1,990	4,681	7,911	19,872
Sales	(2,266)	(7,173)	(13,991)	(26,197)
Included in earnings and reported as losses incurred, net	3	21	518	(431)
Balance at end of period	$ 1,690	$ 7,779	$ 1,690	$ 7,779