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FAIR VALUE MEASUREMENTS (Financial Instruments Measured at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Fixed maturities | $ 12,609,241 | $ 12,468,205
Equity securities | 417,886 | 474,207
Other investments | 760,206 | 770,923
Short-term investments | 69,996 | 38,471
Derivative instruments (refer to Note 5) | 7,267 | 3,174
Total Assets | 13,864,596 | 13,754,980
Liabilities |  |
Derivative instruments (refer to Note 5) | 11,026 | 13,637
Cash settled awards (refer to Note 8) | 10,160 | 21,731
Total Liabilities | 21,186 | 35,368
U.S. government and agency |  |
Assets |  |
Fixed maturities | 1,991,466 | 2,112,881
Non-U.S. government |  |
Assets |  |
Fixed maturities | 673,801 | 576,592
Corporate debt |  |
Assets |  |
Fixed maturities | 4,796,731 | 4,930,254
Agency RMBS |  |
Assets |  |
Fixed maturities | 1,677,106 | 1,592,584
CMBS |  |
Assets |  |
Fixed maturities | 1,380,738 | 1,365,052
Non-agency RMBS |  |
Assets |  |
Fixed maturities | 133,530 | 84,922
ABS |  |
Assets |  |
Fixed maturities | 1,672,175 | 1,598,693
Municipals |  |
Assets |  |
Fixed maturities | 283,694 | 207,227
Common stocks |  |
Assets |  |
Equity securities | 9,295 | 193
Preferred shares |  |
Assets |  |
Equity securities | 7,754 | 0
Exchange-traded funds |  |
Assets |  |
Equity securities | 192,202 | 297,325
Bond mutual funds |  |
Assets |  |
Equity securities | 208,635 | 176,689
Hedge funds |  |
Assets |  |
Other investments | 136,795 | 167,790
Direct lending funds |  |
Assets |  |
Other investments | 269,783 | 277,395
Private equity funds |  |
Assets |  |
Other investments | 106,701 | 80,412
Real estate funds |  |
Assets |  |
Other investments | 153,163 | 130,112
CLO-Equities |  |
Assets |  |
Other investments | 9,189 | 14,328
Other privately held investments |  |
Assets |  |
Other investments | 39,493 | 36,934
Overseas deposits |  |
Assets |  |
Other investments | 45,082 | 63,952
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed maturities | 1,911,014 | 2,053,622
Equity securities | 209,251 | 297,518
Other investments | 0 | 0
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 2,120,265 | 2,351,140
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 | 1,911,014 | 2,053,622
Quoted prices in active markets for identical assets (Level 1) | Non-U.S. government |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Corporate debt |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Agency RMBS |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | CMBS |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Non-agency RMBS |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | ABS |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Municipals |  |
Assets |  |
Fixed maturities | 0 | 0
Quoted prices in active markets for identical assets (Level 1) | Common stocks |  |
Assets |  |
Equity securities | 9,295 | 193
Quoted prices in active markets for identical assets (Level 1) | Preferred shares |  |
Assets |  |
Equity securities | 7,754 | 0
Quoted prices in active markets for identical assets (Level 1) | Exchange-traded funds |  |
Assets |  |
Equity securities | 192,202 | 297,325
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 | 10,673,063 | 10,406,562
Equity securities | 208,635 | 176,689
Other investments | 45,082 | 63,952
Short-term investments | 69,996 | 38,471
Derivative instruments (refer to Note 5) | 7,267 | 3,174
Total Assets | 11,004,043 | 10,688,848
Liabilities |  |
Derivative instruments (refer to Note 5) | 1,578 | 3,965
Cash settled awards (refer to Note 8) | 10,160 | 21,731
Total Liabilities | 11,738 | 25,696
Significant other observable inputs (Level 2) | U.S. government and agency |  |
Assets |  |
Fixed maturities | 80,452 | 59,259
Significant other observable inputs (Level 2) | Non-U.S. government |  |
Assets |  |
Fixed maturities | 673,801 | 576,592
Significant other observable inputs (Level 2) | Corporate debt |  |
Assets |  |
Fixed maturities | 4,794,332 | 4,927,957
Significant other observable inputs (Level 2) | Agency RMBS |  |
Assets |  |
Fixed maturities | 1,677,106 | 1,592,584
Significant other observable inputs (Level 2) | CMBS |  |
Assets |  |
Fixed maturities | 1,378,115 | 1,359,817
Significant other observable inputs (Level 2) | Non-agency RMBS |  |
Assets |  |
Fixed maturities | 123,898 | 84,922
Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed maturities | 1,661,665 | 1,598,204
Significant other observable inputs (Level 2) | Municipals |  |
Assets |  |
Fixed maturities | 283,694 | 207,227
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 | 208,635 | 176,689
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 | 45,082 | 63,952
Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed maturities | 25,164 | 8,021
Equity securities | 0 | 0
Other investments | 48,682 | 51,262
Short-term investments | 0 | 0
Derivative instruments (refer to Note 5) | 0 | 0
Total Assets | 73,846 | 59,283
Liabilities |  |
Derivative instruments (refer to Note 5) | 9,448 | 9,672
Cash settled awards (refer to Note 8) | 0 | 0
Total Liabilities | 9,448 | 9,672
Significant unobservable inputs (Level 3) | U.S. government and agency |  |
Assets |  |
Fixed maturities | 0 | 0
Significant unobservable inputs (Level 3) | Non-U.S. government |  |
Assets |  |
Fixed maturities | 0 | 0
Significant unobservable inputs (Level 3) | Corporate debt |  |
Assets |  |
Fixed maturities | 2,399 | 2,297
Significant unobservable inputs (Level 3) | Agency RMBS |  |
Assets |  |
Fixed maturities | 0 | 0
Significant unobservable inputs (Level 3) | CMBS |  |
Assets |  |
Fixed maturities | 2,623 | 5,235
Significant unobservable inputs (Level 3) | Non-agency RMBS |  |
Assets |  |
Fixed maturities | 9,632 | 0
Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed maturities | 10,510 | 489
Significant unobservable inputs (Level 3) | Municipals |  |
Assets |  |
Fixed maturities | 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 | 9,189 | 14,328
Significant unobservable inputs (Level 3) | Other privately held investments |  |
Assets |  |
Other investments | 39,493 | 36,934
Significant unobservable inputs (Level 3) | Overseas deposits |  |
Assets |  |
Other investments | 0 | 0
Fair value based on NAV practical expedient |  |
Assets |  |
Other investments | 666,442 | 655,709
Fair value based on NAV practical expedient | Hedge funds |  |
Assets |  |
Other investments | 136,795 | 167,790
Fair value based on NAV practical expedient | Direct lending funds |  |
Assets |  |
Other investments | 269,783 | 277,395
Fair value based on NAV practical expedient | Private equity funds |  |
Assets |  |
Other investments | 106,701 | 80,412
Fair value based on NAV practical expedient | Real estate funds |  |
Assets |  |
Other investments | $ 153,163 | $ 130,112

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