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FAIR VALUE OF FINANCIAL INSTRUMENTS - Reconciliation of Beginning and Ending Balances for Fair Value Measurements (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Assets:        
Beginning Balance $ 2,234,198 $ 2,035,710 $ 2,164,553 $ 1,306,979
Included in Operations 81,936 49,818 176,825 78,311
Included in Other Comprehensive Income (Loss) 32,714 24,069 118,607 78,701
Included in Operations (34,483) (50) (106,862) (35,156)
Included in Other Comprehensive Income (Loss) (3,461) (6,684) (95,894) (14,992)
Purchases 75,643 10,850 426,701 737,957
Sales (127,994) (73,121) (502,847) (175,026)
Issuances 0 0 0 0
Settlements 0 0 (4,072) (1,708)
Transfers in/out of Level 3 31,172 41,319 114,340 106,841
Other (342) (1,015) (1,968) (1,011)
Ending Balance 2,289,383 2,080,896 2,289,383 2,080,896
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 47,821 56,828 73,054 43,296
Liabilities:        
Beginning Balance 1,732,315 914,620 1,087,700 514,246
Included in Operations 130,913 0 387,386 830
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (186,311) (192,095) (1,090,130) (560,781)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 33,684 0 70,888
Sales 0 0 0 0
Issuances 37 91 366 158
Settlements 1,254 1,379 4,314 6,132
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 1,786,496 1,139,111 1,786,496 1,139,111
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (54,654) (191,572) (700,933) (558,276)
Annuity account balances        
Liabilities:        
Beginning Balance 68,064 72,585 69,728 76,119
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (744) (523) (1,811) (1,675)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 37 91 366 158
Settlements 1,254 1,379 4,314 6,132
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 67,591 71,820 67,591 71,820
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0 0 0
Other liabilities        
Liabilities:        
Beginning Balance 1,664,251 842,035 1,017,972 438,127
Included in Operations 130,913 0 387,386 830
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (185,567) (191,572) (1,088,319) (559,106)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 33,684 0 70,888
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 1,718,905 1,067,291 1,718,905 1,067,291
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (54,654) (191,572) (700,933) (558,276)
Total investments        
Assets:        
Beginning Balance 2,234,198 2,035,710 2,164,553 1,306,979
Included in Operations 81,936 49,818 176,825 78,311
Included in Other Comprehensive Income (Loss) 32,714 24,069 118,607 78,701
Included in Operations (34,483) (50) (106,862) (35,156)
Included in Other Comprehensive Income (Loss) (3,461) (6,684) (95,894) (14,992)
Purchases 75,643 10,850 426,701 737,957
Sales (127,994) (73,121) (502,847) (175,026)
Issuances 0 0 0 0
Settlements 0 0 (4,072) (1,708)
Transfers in/out of Level 3 31,172 41,319 114,340 106,841
Other (342) (1,015) (1,968) (1,011)
Ending Balance 2,289,383 2,080,896 2,289,383 2,080,896
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 47,821 56,828 73,054 43,296
Fixed maturities        
Assets:        
Beginning Balance 1,879,678 1,823,641 1,881,740 1,092,216
Included in Operations 2,992 361 4,947 5,064
Included in Other Comprehensive Income (Loss) 32,714 24,069 118,607 78,701
Included in Operations (406) (48) (9,156) (3,720)
Included in Other Comprehensive Income (Loss) (3,461) (6,684) (95,894) (14,992)
Purchases 68,693 10,850 378,497 731,299
Sales (127,994) (73,121) (502,847) (175,026)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 31,172 41,319 109,120 106,841
Other (342) (1,015) (1,968) (1,011)
Ending Balance 1,883,046 1,819,372 1,883,046 1,819,372
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 2,954 7,180 2,954 2,832
Fixed maturities | Available-for-sale securities        
Assets:        
Beginning Balance 1,806,898 1,756,167 1,804,962 1,059,918
Included in Operations 0 0 0 528
Included in Other Comprehensive Income (Loss) 32,714 24,069 118,607 78,701
Included in Operations (12) (14) (33) (71)
Included in Other Comprehensive Income (Loss) (3,461) (6,684) (95,894) (14,992)
Purchases 62,185 9,150 365,449 714,136
Sales (126,423) (72,242) (498,683) (167,220)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 31,172 41,319 110,294 80,574
Other (348) (956) (1,977) (765)
Ending Balance 1,802,725 1,750,809 1,802,725 1,750,809
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0 0 0
Fixed maturities | Trading securities        
Assets:        
Beginning Balance 72,780 67,474 76,778 32,298
Included in Operations 2,992 361 4,947 4,536
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (394) (34) (9,123) (3,649)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 6,508 1,700 13,048 17,163
Sales (1,571) (879) (4,164) (7,806)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 (1,174) 26,267
Other 6 (59) 9 (246)
Ending Balance 80,321 68,563 80,321 68,563
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 2,954 7,180 2,954 2,832
Residential mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 0 0    
Included in Operations 0 0    
Included in Other Comprehensive Income (Loss) 0 0    
Included in Operations 0 0    
Included in Other Comprehensive Income (Loss) 0 0    
Purchases 0 0    
Sales 0 0    
Issuances 0 0    
Settlements 0 0    
Transfers in/out of Level 3 0 0    
Other 0 0    
Ending Balance 0 0 0 0
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0    
Residential mortgage-backed securities | Trading securities        
Assets:        
Beginning Balance     0  
Included in Operations     0  
Included in Other Comprehensive Income (Loss)     0  
Included in Operations     0  
Included in Other Comprehensive Income (Loss)     0  
Purchases     0  
Sales     0  
Issuances     0  
Settlements     0  
Transfers in/out of Level 3     0  
Other     0  
Ending Balance 0   0  
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date     0  
Commercial mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 9,971 9,366 10,029 0
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 740 294 1,520 310
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 1 0 (784) 0
Purchases 0 0 0 9,359
Sales (21) (19) (62) (26)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Other (6) (6) (18) (8)
Ending Balance 10,685 9,635 10,685 9,635
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0 0 0
Other asset-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 430,964 418,310 421,219 421,642
Included in Operations 0 0 0 446
Included in Other Comprehensive Income (Loss) 4,383 865 4,495 11,525
Included in Operations (12) (14) (33) (71)
Included in Other Comprehensive Income (Loss) (525) (3,276) (12,978) (8,075)
Purchases 0 0 0 0
Sales (517) (8) (1,034) (10,023)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 22,187 0
Other 203 185 640 618
Ending Balance 434,496 416,062 434,496 416,062
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0 0 0
Other asset-backed securities | Trading securities        
Assets:        
Beginning Balance 60,622 62,180 65,407 26,056
Included in Operations 2,706 294 4,174 4,300
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (382) (34) (8,696) (3,618)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 1,031 0 4,250 15,463
Sales (1,571) (879) (2,023) (6,771)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 (766) 26,267
Other 36 (34) 96 (170)
Ending Balance 62,442 61,527 62,442 61,527
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 2,681 274 2,681 (2,442)
Corporate securities | Available-for-sale securities        
Assets:        
Beginning Balance 1,365,963 1,328,491 1,373,714 638,276
Included in Operations 0 0 0 82
Included in Other Comprehensive Income (Loss) 27,591 22,910 112,592 66,866
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) (2,937) (3,408) (82,132) (6,917)
Purchases 62,185 9,150 365,449 704,777
Sales (125,885) (72,215) (497,587) (157,171)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 31,172 41,319 88,107 80,574
Other (545) (1,135) (2,599) (1,375)
Ending Balance 1,357,544 1,325,112 1,357,544 1,325,112
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0 0 0
Corporate securities | Trading securities        
Assets:        
Beginning Balance 12,158 5,294 11,371 6,242
Included in Operations 286 67 773 236
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (12) 0 (427) (31)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 5,477 1,700 8,798 1,700
Sales 0 0 (2,141) (1,035)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 (408) 0
Other (30) (25) (87) (76)
Ending Balance 17,879 7,036 17,879 7,036
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 273 6,906 273 5,274
Equity securities        
Assets:        
Beginning Balance 78,613 68,486 72,970 63,421
Included in Operations 780 0 781 1
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations 0 (2) (1) (17)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 6,950 0 7,373 5,079
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 5,220 0
Other 0 0 0 0
Ending Balance 86,343 68,484 86,343 68,484
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 780 191 780 345
Other long-term investments        
Assets:        
Beginning Balance 275,907 143,583 209,843 151,342
Included in Operations 78,164 49,457 171,097 73,246
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (34,077) 0 (97,705) (31,419)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 40,831 1,579
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 (4,072) (1,708)
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 319,994 193,040 319,994 193,040
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 44,087 49,457 69,320 40,119
Short-term investments        
Assets:        
Beginning Balance     0 0
Included in Operations     0 0
Included in Other Comprehensive Income (Loss)     0 0
Included in Operations     0 0
Included in Other Comprehensive Income (Loss)     0 0
Purchases     0 0
Sales     0 0
Issuances     0 0
Settlements     0 0
Transfers in/out of Level 3     0 0
Other     0 0
Ending Balance $ 0 $ 0 0 0
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date     $ 0 $ 0