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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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