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Investments - Available for Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,621,453
Less: loaned securities and securities sold under repurchase agreements	137,282	$ 103,996
Total fixed-maturities available for sale	5,535,532	5,367,729
Fair Value	4,985,406
Total fixed-maturities available for sale	4,909,232	5,517,078
Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Total fixed-maturities available for sale	5,535,532	5,367,729
Total fixed-maturities available for sale	4,909,232	5,517,078
Loaned securities, amortized cost
Debt Securities, Available-for-sale [Line Items]
Less: loaned securities and securities sold under repurchase agreements	85,921
Loaned securities, fair value
Debt Securities, Available-for-sale [Line Items]
Less: loaned securities and securities sold under repurchase agreements	76,174
Fixed-maturities available for sale | U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	175,175	221,407
Gross Unrealized Gains	0	1,719
Gross Unrealized Losses	(28,511)	(1,396)
Fair Value	146,664	221,730
Fixed-maturities available for sale | State and municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	164,045	162,964
Gross Unrealized Gains	0	14,694
Gross Unrealized Losses	(21,302)	(401)
Fair Value	142,743	177,257
Fixed-maturities available for sale | Corporate bonds and notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,869,400	2,867,063
Gross Unrealized Gains	132	133,665
Gross Unrealized Losses	(400,572)	(24,886)
Fair Value	2,468,960	2,975,842
Fixed-maturities available for sale | RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,010,453	697,581
Gross Unrealized Gains	522	14,313
Gross Unrealized Losses	(110,384)	(6,777)
Fair Value	900,591	705,117
Fixed-maturities available for sale | CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	656,321	690,827
Gross Unrealized Gains	4	21,444
Gross Unrealized Losses	(47,196)	(3,068)
Fair Value	609,129	709,203
Fixed-maturities available for sale | CLO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	518,261	529,906
Gross Unrealized Gains	0	1,032
Gross Unrealized Losses	(20,312)	(898)
Fair Value	497,949	530,040
Fixed-maturities available for sale | Other ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	177,299	210,657
Gross Unrealized Gains	26	1,142
Gross Unrealized Losses	(6,362)	(612)
Fair Value	170,963	211,187
Fixed-maturities available for sale | Foreign government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,115	5,109
Gross Unrealized Gains	0	187
Gross Unrealized Losses	(145)	0
Fair Value	4,970	5,296
Fixed-maturities available for sale | Mortgage insurance-linked notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	45,384	45,384
Gross Unrealized Gains	0	1,633
Gross Unrealized Losses	(1,947)	0
Fair Value	43,437	47,017
Fixed-maturities available for sale | Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,621,453	5,430,898
Gross Unrealized Gains	684	189,829
Gross Unrealized Losses	(636,731)	(38,038)
Fair Value	4,985,406	5,582,689
Fixed-maturities available for sale | Loaned securities, amortized cost | Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Less: loaned securities and securities sold under repurchase agreements	85,921	63,169
Fixed-maturities available for sale | Loaned securities, fair value | Total fixed-maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Less: loaned securities and securities sold under repurchase agreements	$ 76,174	$ 65,611

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