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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Assets:        
Beginning Balance $ 2,039,970 $ 1,337,537 $ 2,164,553 $ 1,306,979
Included in Operations 81,368 23,722 94,889 28,493
Included in Other Comprehensive Income (Loss) 83,479 27,900 85,893 54,632
Included in Operations (13,022) (16,252) (72,379) (35,107)
Included in Other Comprehensive Income (Loss) (9,108) (4,965) (92,433) (8,308)
Purchases 323,223 677,645 351,058 727,108
Sales (324,579) (56,977) (374,853) (101,905)
Issuances 0 0 0 0
Settlements 0 (1,708) (4,072) (1,708)
Transfers in/out of Level 3 53,639 48,553 83,168 65,522
Other (772) 255 (1,626) 4
Ending Balance 2,234,198 2,035,710 2,234,198 2,035,710
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (74,544) 5,814 23,685 (7,914)
Liabilities:        
Beginning Balance 1,330,669 681,268 1,087,700 514,246
Included in Operations 67,431 364 256,473 830
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (469,940) (199,365) (903,819) (368,686)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 37,204 0 37,204
Sales 0 0 0 0
Issuances 204 56 329 67
Settlements 1,067 2,909 3,060 4,753
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 1,732,315 914,620 1,732,315 914,620
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (401,977) (198,176) (646,279) (366,704)
Annuity account balances        
Liabilities:        
Beginning Balance 68,395 74,613 69,728 76,119
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (532) (825) (1,067) (1,152)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 204 56 329 67
Settlements 1,067 2,909 3,060 4,753
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 68,064 72,585 68,064 72,585
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0 0 0
Other liabilities        
Liabilities:        
Beginning Balance 1,262,274 606,655 1,017,972 438,127
Included in Operations 67,431 364 256,473 830
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (469,408) (198,540) (902,752) (367,534)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 0 37,204 0 37,204
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 1,664,251 842,035 1,664,251 842,035
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (401,977) (198,176) (646,279) (366,704)
Total investments        
Assets:        
Beginning Balance 2,039,970 1,337,537 2,164,553 1,306,979
Included in Operations 81,368 23,722 94,889 28,493
Included in Other Comprehensive Income (Loss) 83,479 27,900 85,893 54,632
Included in Operations (13,022) (16,252) (72,379) (35,107)
Included in Other Comprehensive Income (Loss) (9,108) (4,965) (92,433) (8,308)
Purchases 323,223 677,645 351,058 727,108
Sales (324,579) (56,977) (374,853) (101,905)
Issuances 0 0 0 0
Settlements 0 (1,708) (4,072) (1,708)
Transfers in/out of Level 3 53,639 48,553 83,168 65,522
Other (772) 255 (1,626) 4
Ending Balance 2,234,198 2,035,710 2,234,198 2,035,710
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (74,544) 5,814 23,685 (7,914)
Fixed maturities        
Assets:        
Beginning Balance 1,804,921 1,140,434 1,881,740 1,092,216
Included in Operations 1,954 960 1,955 4,703
Included in Other Comprehensive Income (Loss) 83,479 27,900 85,893 54,632
Included in Operations (6,605) (3,505) (8,750) (3,672)
Included in Other Comprehensive Income (Loss) (9,108) (4,965) (92,433) (8,308)
Purchases 281,969 670,986 309,804 720,449
Sales (324,579) (56,977) (374,853) (101,905)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 48,419 48,553 77,948 65,522
Other (772) 255 (1,626) 4
Ending Balance 1,879,678 1,823,641 1,879,678 1,823,641
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (4,761) (2,649) (4,760) 1,202
Fixed maturities | Available-for-sale securities        
Assets:        
Beginning Balance 1,726,881 1,068,699 1,804,962 1,059,918
Included in Operations 0 82 0 528
Included in Other Comprehensive Income (Loss) 83,479 27,900 85,893 54,632
Included in Operations (21) (37) (21) (57)
Included in Other Comprehensive Income (Loss) (9,108) (4,965) (92,433) (8,308)
Purchases 279,264 670,986 303,264 704,986
Sales (322,415) (56,197) (372,260) (94,978)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 49,593 49,350 79,122 39,255
Other (775) 349 (1,629) 191
Ending Balance 1,806,898 1,756,167 1,806,898 1,756,167
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 78,040 71,735 76,778 32,298
Included in Operations 1,954 878 1,955 4,175
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (6,584) (3,468) (8,729) (3,615)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 2,705 0 6,540 15,463
Sales (2,164) (780) (2,593) (6,927)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (1,174) (797) (1,174) 26,267
Other 3 (94) 3 (187)
Ending Balance 72,780 67,474 72,780 67,474
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (4,761) (2,649) (4,760) 1,202
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 10,783 0 10,029 0
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) 0 16 780 16
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) (785) 0 (785) 0
Purchases 0 9,359 0 9,359
Sales (21) (7) (41) (7)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Other (6) (2) (12) (2)
Ending Balance 9,971 9,366 9,971 9,366
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 436,329 420,091 421,219 421,642
Included in Operations 0 0 0 446
Included in Other Comprehensive Income (Loss) 112 2,513 112 10,660
Included in Operations (21) (37) (21) (57)
Included in Other Comprehensive Income (Loss) (5,125) (4,468) (12,453) (4,799)
Purchases 0 0 0 0
Sales (509) (7) (517) (10,015)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 22,187 0
Other 178 218 437 433
Ending Balance 430,964 418,310 430,964 418,310
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 65,028 66,484 65,407 26,056
Included in Operations 1,467 810 1,468 4,006
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (6,584) (3,468) (8,314) (3,584)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 1,469 0 3,219 15,463
Sales (23) (781) (452) (5,892)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (766) (797) (766) 26,267
Other 31 (68) 60 (136)
Ending Balance 60,622 62,180 60,622 62,180
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (5,149) (2,717) (5,149) 1,068
Corporate securities | Available-for-sale securities        
Assets:        
Beginning Balance 1,279,769 648,608 1,373,714 638,276
Included in Operations 0 82 0 82
Included in Other Comprehensive Income (Loss) 83,367 25,371 85,001 43,956
Included in Operations 0 0 0 0
Included in Other Comprehensive Income (Loss) (3,198) (497) (79,195) (3,509)
Purchases 279,264 661,627 303,264 695,627
Sales (321,885) (56,183) (371,702) (84,956)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 49,593 49,350 56,935 39,255
Other (947) 133 (2,054) (240)
Ending Balance 1,365,963 1,328,491 1,365,963 1,328,491
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 13,012 5,251 11,371 6,242
Included in Operations 487 68 487 169
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations 0 0 (415) (31)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 1,236 0 3,321 0
Sales (2,141) 1 (2,141) (1,035)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (408) 0 (408) 0
Other (28) (26) (57) (51)
Ending Balance 12,158 5,294 12,158 5,294
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 388 68 389 134
Equity securities        
Assets:        
Beginning Balance 72,968 63,409 72,970 63,421
Included in Operations 1 0 1 1
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations 1 (3) (1) (16)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 423 5,080 423 5,080
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 5,220 0 5,220 0
Other 0 0 0 0
Ending Balance 78,613 68,486 78,613 68,486
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 3,212 153 3,212 222
Other long-term investments        
Assets:        
Beginning Balance 162,081 133,694 209,843 151,342
Included in Operations 79,413 22,762 92,933 23,789
Included in Other Comprehensive Income (Loss) 0 0 0 0
Included in Operations (6,418) (12,744) (63,628) (31,419)
Included in Other Comprehensive Income (Loss) 0 0 0 0
Purchases 40,831 1,579 40,831 1,579
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 (1,708) (4,072) (1,708)
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 275,907 143,583 275,907 143,583
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (72,995) 8,310 25,233 (9,338)
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