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FAIR VALUE MEASUREMENTS - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Fixed maturities, available for sale | $ 11,304,682 | $ 12,313,200
Equity securities | 522,161 | 655,675
Other investments | 981,774 | 947,982
Short-term investments | 65,683 | 31,063
Derivative instruments (refer to Note 5) | 3,218 | 3,116
Total Assets | 12,877,518 | 13,951,036
Liabilities |  |
Derivative Instruments | 24,373 | 20,617
Cash settled awards | 3,796 | 9,091
Total Liabilities | 28,169 | 29,708
U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 2,438,309 | 2,682,448
Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 654,720 | 795,178
Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,341,057 | 4,495,312
Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,019,124 | 1,074,589
CMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,083,040 | 1,248,191
Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 148,104 | 186,164
ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,456,150 | 1,622,480
Municipals |  |
Assets |  |
Fixed maturities, available for sale | 164,178 | 208,838
Common stocks |  |
Assets |  |
Equity securities | 2,978 | 1,364
Preferred stocks |  |
Assets |  |
Equity securities | 96 | 179
Exchange-traded funds |  |
Assets |  |
Equity securities | 306,057 | 336,815
Bond mutual funds |  |
Assets |  |
Equity securities | 213,030 | 317,317
Hedge funds |  |
Assets |  |
Other investments | 44,653 | 59,488
Direct lending funds |  |
Assets |  |
Other investments | 260,120 | 289,867
Private equity funds |  |
Assets |  |
Other investments | 266,412 | 249,974
Real estate funds |  |
Assets |  |
Other investments | 289,811 | 238,222
CLO-Equities |  |
Assets |  |
Other investments | 4,808 | 5,910
Other privately held investments |  |
Assets |  |
Other investments | 115,970 | 104,521
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed maturities, available for sale | 2,394,635 | 2,632,541
Equity securities | 309,131 | 338,358
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 2,703,766 | 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 | 2,394,635 | 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 | 2,978 | 1,364
Quoted prices in active markets for identical assets (Level 1) | Preferred stocks |  |
Assets |  |
Equity securities | 96 | 179
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds |  |
Assets |  |
Equity securities | 306,057 | 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 | 8,837,217 | 9,637,765
Equity securities | 213,030 | 317,317
Other investments | 0 | 0
Short-term investments | 65,683 | 31,063
Derivative instruments (refer to Note 5) | 3,218 | 3,116
Total Assets | 9,119,148 | 9,989,261
Liabilities |  |
Derivative Instruments | 19,665 | 14,987
Cash settled awards | 3,796 | 9,091
Total Liabilities | 23,461 | 24,078
Significant other observable inputs (Level 2) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 43,674 | 49,907
Significant other observable inputs (Level 2) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 654,720 | 795,178
Significant other observable inputs (Level 2) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,268,227 | 4,452,418
Significant other observable inputs (Level 2) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,019,124 | 1,074,589
Significant other observable inputs (Level 2) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,083,040 | 1,248,191
Significant other observable inputs (Level 2) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 148,104 | 186,164
Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,456,150 | 1,622,480
Significant other observable inputs (Level 2) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 164,178 | 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 | 213,030 | 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 | 72,830 | 42,894
Equity securities | 0 | 0
Other investments | 120,778 | 110,431
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 193,608 | 153,325
Liabilities |  |
Derivative Instruments | 4,708 | 5,630
Cash settled awards | 0 | 0
Total Liabilities | 4,708 | 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 | 72,830 | 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 | 4,808 | 5,910
Significant unobservable inputs (Level 3) | Other privately held investments |  |
Assets |  |
Other investments | 115,970 | 104,521
Fair value based on NAV practical expedient |  |
Assets |  |
Other investments | 860,996 | 837,551
Total Assets | 860,996 | 837,551
Fair value based on NAV practical expedient | Hedge funds |  |
Assets |  |
Other investments | 44,653 | 59,488
Fair value based on NAV practical expedient | Direct lending funds |  |
Assets |  |
Other investments | 260,120 | 289,867
Fair value based on NAV practical expedient | Private equity funds |  |
Assets |  |
Other investments | 266,412 | 249,974
Fair value based on NAV practical expedient | Real estate funds |  |
Assets |  |
Other investments | $ 289,811 | $ 238,222

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