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FAIR VALUE MEASUREMENTS - Summary of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Fixed maturities, available for sale | $ 11,326,894 | $ 12,313,200
Equity securities | 485,253 | 655,675
Other investments | 996,751 | 947,982
Short-term investments | 70,310 | 31,063
Derivative instruments | 37,682 | 3,116
Total Assets | 12,916,890 | 13,951,036
Liabilities |  |
Derivative instruments | 703 | 20,617
Cash-settled awards | 4,792 | 9,091
Total Liabilities | 5,495 | 29,708
U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 2,639,330 | 2,682,448
Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 562,029 | 795,178
Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,255,556 | 4,495,312
Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,202,785 | 1,074,589
CMBS |  |
Assets |  |
Fixed maturities, available for sale | 947,778 | 1,248,191
Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 133,534 | 186,164
ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,429,527 | 1,622,480
Municipals |  |
Assets |  |
Fixed maturities, available for sale | 156,355 | 208,838
Common stocks |  |
Assets |  |
Equity securities | 7,473 | 1,364
Preferred stocks |  |
Assets |  |
Equity securities | 72 | 179
Exchange-traded funds |  |
Assets |  |
Equity securities | 269,806 | 336,815
Bond mutual funds |  |
Assets |  |
Equity securities | 207,902 | 317,317
Hedge funds |  |
Assets |  |
Other investments | 32,616 | 59,488
Direct lending funds |  |
Assets |  |
Other investments | 258,626 | 289,867
Private equity funds |  |
Assets |  |
Other investments | 265,836 | 249,974
Real estate funds |  |
Assets |  |
Other investments | 298,499 | 238,222
CLO-Equities |  |
Assets |  |
Other investments | 5,016 | 5,910
Other privately held investments |  |
Assets |  |
Other investments | 136,158 | 104,521
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed maturities, available for sale | 2,600,636 | 2,632,541
Equity securities | 277,351 | 338,358
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative instruments | 0 | 0
Total Assets | 2,877,987 | 2,970,899
Liabilities |  |
Derivative instruments | 0 | 0
Cash-settled awards | 0 | 0
Total Liabilities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 2,600,636 | 2,632,541
Quoted prices in active markets for identical assets (Level 1) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Common stocks |  |
Assets |  |
Equity securities | 7,473 | 1,364
Quoted prices in active markets for identical assets (Level 1) | Preferred stocks |  |
Assets |  |
Equity securities | 72 | 179
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds |  |
Assets |  |
Equity securities | 269,806 | 336,815
Quoted prices in active markets for identical assets (Level 1) | Bond mutual funds |  |
Assets |  |
Equity securities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Hedge funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Direct lending funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Private equity funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Real estate funds |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | CLO-Equities |  |
Assets |  |
Other investments | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Other privately held investments |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed maturities, available for sale | 8,607,154 | 9,637,765
Equity securities | 207,902 | 317,317
Other investments | 0 | 0
Short-term investments | 70,310 | 31,063
Derivative instruments | 37,682 | 3,116
Total Assets | 8,923,048 | 9,989,261
Liabilities |  |
Derivative instruments | 703 | 14,987
Cash-settled awards | 4,792 | 9,091
Total Liabilities | 5,495 | 24,078
Significant other observable inputs (Level 2) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 38,694 | 49,907
Significant other observable inputs (Level 2) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 562,029 | 795,178
Significant other observable inputs (Level 2) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,136,452 | 4,452,418
Significant other observable inputs (Level 2) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,202,785 | 1,074,589
Significant other observable inputs (Level 2) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 947,778 | 1,248,191
Significant other observable inputs (Level 2) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 133,534 | 186,164
Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,429,527 | 1,622,480
Significant other observable inputs (Level 2) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 156,355 | 208,838
Significant other observable inputs (Level 2) | Common stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Preferred stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Exchange-traded funds |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Bond mutual funds |  |
Assets |  |
Equity securities | 207,902 | 317,317
Significant other observable inputs (Level 2) | Hedge funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Direct lending funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Private equity funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Real estate funds |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | CLO-Equities |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) | Other privately held investments |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed maturities, available for sale | 119,104 | 42,894
Equity securities | 0 | 0
Other investments | 141,174 | 110,431
Short-term investments | 0 | 0
Derivative instruments | 0 | 0
Total Assets | 260,278 | 153,325
Liabilities |  |
Derivative instruments | 0 | 5,630
Cash-settled awards | 0 | 0
Total Liabilities | 0 | 5,630
Significant unobservable inputs (Level 3) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 119,104 | 42,894
Significant unobservable inputs (Level 3) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 0 | 0
Significant unobservable inputs (Level 3) | Common stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Preferred stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Exchange-traded funds |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Bond mutual funds |  |
Assets |  |
Equity securities | 0 | 0
Significant unobservable inputs (Level 3) | Hedge funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | Direct lending funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | Private equity funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | Real estate funds |  |
Assets |  |
Other investments | 0 | 0
Significant unobservable inputs (Level 3) | CLO-Equities |  |
Assets |  |
Other investments | 5,016 | 5,910
Significant unobservable inputs (Level 3) | Other privately held investments |  |
Assets |  |
Other investments | 136,158 | 104,521
Fair value based on NAV practical expedient |  |
Assets |  |
Other investments | 855,577 | 837,551
Total Assets | 855,577 | 837,551
Fair value based on NAV practical expedient | Hedge funds |  |
Assets |  |
Other investments | 32,616 | 59,488
Fair value based on NAV practical expedient | Direct lending funds |  |
Assets |  |
Other investments | 258,626 | 289,867
Fair value based on NAV practical expedient | Private equity funds |  |
Assets |  |
Other investments | 265,836 | 249,974
Fair value based on NAV practical expedient | Real estate funds |  |
Assets |  |
Other investments | 298,499 | 238,222
Fair value based on NAV practical expedient | CLO-Equities |  |
Assets |  |
Other investments | 0 | 0
Fair value based on NAV practical expedient | Other privately held investments |  |
Assets |  |
Other investments | $ 0 | $ 0

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