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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Fixed maturities, available for sale | $ 11,898,300 | $ 12,041,799
Equity securities | 588,196 | 518,445
Other investments | 865,238 | 829,156
Short-term investments | 112,862 | 161,897
Derivative instruments (refer to Note 5) | 3,140 | 18,875
Total Assets | 13,467,736 | 13,570,172
Liabilities |  |
Derivative instruments (refer to Note 5) | 18,382 | 11,486
Cash settled awards (refer to Note 8) | 5,804 | 13,273
Total Liabilities | 24,186 | 24,759
U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 2,551,940 | 1,918,699
Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 680,572 | 671,273
Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,499,394 | 4,655,951
Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,044,556 | 1,286,209
CMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,144,592 | 1,353,587
Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 207,489 | 140,104
ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,499,639 | 1,720,078
Municipals |  |
Assets |  |
Fixed maturities, available for sale | 270,118 | 295,898
Common stocks |  |
Assets |  |
Equity securities | 952 | 10,942
Preferred shares |  |
Assets |  |
Equity securities | 251 | 8,068
Exchange-traded funds |  |
Assets |  |
Equity securities | 309,985 | 221,718
Bond mutual funds |  |
Assets |  |
Equity securities | 277,008 | 277,717
Hedge funds |  |
Assets |  |
Other investments | 112,748 | 146,720
Direct lending funds |  |
Assets |  |
Other investments | 288,404 | 272,131
Private equity funds |  |
Assets |  |
Other investments | 190,465 | 124,706
Real estate funds |  |
Assets |  |
Other investments | 201,833 | 164,250
CLO-Equities |  |
Assets |  |
Other investments | 7,002 | 6,173
Other privately held investments |  |
Assets |  |
Other investments | 64,786 | 70,011
Overseas deposits |  |
Assets |  |
Other investments | 0 | 45,165
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed maturities, available for sale | 2,504,245 | 1,861,240
Equity securities | 311,188 | 240,728
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 2,815,433 | 2,101,968
Liabilities |  |
Derivative instruments (refer to Note 5) | 0 | 0
Cash settled awards (refer to Note 8) | 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 | 2,504,245 | 1,861,240
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 | 952 | 10,942
Quoted prices in active markets for identical assets (Level 1) | Preferred shares |  |
Assets |  |
Equity securities | 251 | 8,068
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds |  |
Assets |  |
Equity securities | 309,985 | 221,718
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
Quoted prices in active markets for identical assets (Level 1) | Overseas deposits |  |
Assets |  |
Other investments | 0 | 0
Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed maturities, available for sale | 9,358,769 | 10,165,650
Equity securities | 277,008 | 277,717
Other investments | 0 | 45,165
Short-term investments | 112,862 | 161,897
Derivative instruments (refer to Note 5) | 3,140 | 18,875
Total Assets | 9,751,779 | 10,669,304
Liabilities |  |
Derivative instruments (refer to Note 5) | 10,265 | 2,364
Cash settled awards (refer to Note 8) | 5,804 | 13,273
Total Liabilities | 16,069 | 15,637
Significant other observable inputs (Level 2) | U.S. government and agency |  |
Assets |  |
Fixed maturities, available for sale | 47,695 | 57,459
Significant other observable inputs (Level 2) | Non-U.S. government |  |
Assets |  |
Fixed maturities, available for sale | 680,572 | 671,273
Significant other observable inputs (Level 2) | Corporate debt |  |
Assets |  |
Fixed maturities, available for sale | 4,476,668 | 4,653,447
Significant other observable inputs (Level 2) | Agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,044,556 | 1,286,209
Significant other observable inputs (Level 2) | CMBS |  |
Assets |  |
Fixed maturities, available for sale | 1,144,592 | 1,351,847
Significant other observable inputs (Level 2) | Non-agency RMBS |  |
Assets |  |
Fixed maturities, available for sale | 207,489 | 140,104
Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed maturities, available for sale | 1,487,079 | 1,709,413
Significant other observable inputs (Level 2) | Municipals |  |
Assets |  |
Fixed maturities, available for sale | 270,118 | 295,898
Significant other observable inputs (Level 2) | Common stocks |  |
Assets |  |
Equity securities | 0 | 0
Significant other observable inputs (Level 2) | Preferred shares |  |
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 | 277,008 | 277,717
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 other observable inputs (Level 2) | Overseas deposits |  |
Assets |  |
Other investments | 0 | 45,165
Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed maturities, available for sale | 35,286 | 14,909
Equity securities | 0 | 0
Other investments | 71,788 | 76,184
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 107,074 | 91,093
Liabilities |  |
Derivative instruments (refer to Note 5) | 8,117 | 9,122
Cash settled awards (refer to Note 8) | 0 | 0
Total Liabilities | 8,117 | 9,122
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 | 22,726 | 2,504
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 | 1,740
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 | 12,560 | 10,665
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 shares |  |
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 | 7,002 | 6,173
Significant unobservable inputs (Level 3) | Other privately held investments |  |
Assets |  |
Other investments | 64,786 | 70,011
Significant unobservable inputs (Level 3) | Overseas deposits |  |
Assets |  |
Other investments | 0 | 0
Fair value based on NAV practical expedient |  |
Assets |  |
Other investments | 793,450 | 707,807
Fair value based on NAV practical expedient | Hedge funds |  |
Assets |  |
Other investments | 112,748 | 146,720
Fair value based on NAV practical expedient | Direct lending funds |  |
Assets |  |
Other investments | 288,404 | 272,131
Fair value based on NAV practical expedient | Private equity funds |  |
Assets |  |
Other investments | 190,465 | 124,706
Fair value based on NAV practical expedient | Real estate funds |  |
Assets |  |
Other investments | $ 201,833 | $ 164,250

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