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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
Mar. 31, 2020
Mar. 31, 2019
Assets:    
Beginning Balance $ 2,164,553 $ 1,306,979
Included in Operations 13,521 4,771
Included in Other Comprehensive Income (Loss) 2,414 26,732
Included in Operations (59,357) (18,855)
Included in Other Comprehensive Income (Loss) (83,325) (3,343)
Purchases 27,835 49,463
Sales (50,274) (44,928)
Issuances 0 0
Settlements (4,072) 0
Transfers in/out of Level 3 29,529 16,969
Other (854) (251)
Ending Balance 2,039,970 1,337,537
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (49,483) (12,215)
Liabilities:    
Beginning Balance 1,087,700 514,246
Included in Operations 189,042 466
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (433,879) (169,320)
Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issuances 125 11
Settlements 1,993 1,843
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 1,330,669 681,268
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (244,302) (168,528)
Annuity account balances    
Liabilities:    
Beginning Balance 69,728 76,119
Included in Operations 0 0
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (535) (326)
Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issuances 125 11
Settlements 1,993 1,843
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 68,395 74,613
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0
Other liabilities    
Liabilities:    
Beginning Balance 1,017,972 438,127
Included in Operations 189,042 466
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (433,344) (168,994)
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 1,262,274 606,655
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (244,302) (168,528)
Total investments    
Assets:    
Beginning Balance 2,164,553 1,306,979
Included in Operations 13,521 4,771
Included in Other Comprehensive Income (Loss) 2,414 26,732
Included in Operations (59,357) (18,855)
Included in Other Comprehensive Income (Loss) (83,325) (3,343)
Purchases 27,835 49,463
Sales (50,274) (44,928)
Issuances 0 0
Settlements (4,072) 0
Transfers in/out of Level 3 29,529 16,969
Other (854) (251)
Ending Balance 2,039,970 1,337,537
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (49,483) (12,215)
Fixed maturities    
Assets:    
Beginning Balance 1,881,740 1,092,216
Included in Operations 1 3,743
Included in Other Comprehensive Income (Loss) 2,414 26,732
Included in Operations (2,145) (167)
Included in Other Comprehensive Income (Loss) (83,325) (3,343)
Purchases 27,835 49,463
Sales (50,274) (44,928)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 29,529 16,969
Other (854) (251)
Ending Balance 1,804,921 1,140,434
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (2,145) 5,364
Fixed maturities | Available-for-sale securities    
Assets:    
Beginning Balance 1,804,962 1,059,918
Included in Operations 0 446
Included in Other Comprehensive Income (Loss) 2,414 26,732
Included in Operations 0 (20)
Included in Other Comprehensive Income (Loss) (83,325) (3,343)
Purchases 24,000 34,000
Sales (49,845) (38,781)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 29,529 (10,095)
Other (854) (158)
Ending Balance 1,726,881 1,068,699
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0
Fixed maturities | Trading securities    
Assets:    
Beginning Balance 76,778 32,298
Included in Operations 1 3,297
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (2,145) (147)
Included in Other Comprehensive Income (Loss) 0 0
Purchases 3,835 15,463
Sales (429) (6,147)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 27,064
Other 0 (93)
Ending Balance 78,040 71,735
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (2,145) 5,364
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
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0
Commercial mortgage-backed securities | Available-for-sale securities    
Assets:    
Beginning Balance 10,029 0
Included in Operations 0 0
Included in Other Comprehensive Income (Loss) 780 0
Included in Operations 0 0
Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales (20) 0
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 0
Other (6) 0
Ending Balance 10,783 0
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0
Other asset-backed securities | Available-for-sale securities    
Assets:    
Beginning Balance 421,219 421,642
Included in Operations 0 446
Included in Other Comprehensive Income (Loss) 0 8,147
Included in Operations 0 (20)
Included in Other Comprehensive Income (Loss) (7,328) (331)
Purchases 0 0
Sales (8) (10,008)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 22,187 0
Other 259 215
Ending Balance 436,329 420,091
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0
Other asset-backed securities | Trading securities    
Assets:    
Beginning Balance 65,407 26,056
Included in Operations 1 3,196
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (1,730) (116)
Included in Other Comprehensive Income (Loss) 0 0
Purchases 1,750 15,463
Sales (429) (5,111)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 27,064
Other 29 (68)
Ending Balance 65,028 66,484
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (1,729) 5,330
Corporate securities | Available-for-sale securities    
Assets:    
Beginning Balance 1,373,714 638,276
Included in Operations 0 0
Included in Other Comprehensive Income (Loss) 1,634 18,585
Included in Operations 0 0
Included in Other Comprehensive Income (Loss) (75,997) (3,012)
Purchases 24,000 34,000
Sales (49,817) (28,773)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 7,342 (10,095)
Other (1,107) (373)
Ending Balance 1,279,769 648,608
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 0 0
Corporate securities | Trading securities    
Assets:    
Beginning Balance 11,371 6,242
Included in Operations 0 101
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (415) (31)
Included in Other Comprehensive Income (Loss) 0 0
Purchases 2,085 0
Sales 0 (1,036)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 0
Other (29) (25)
Ending Balance 13,012 5,251
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date (416) 34
Equity securities    
Assets:    
Beginning Balance 72,970 63,421
Included in Operations 0 1
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (2) (13)
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 72,968 63,409
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date 424 69
Other long-term investments    
Assets:    
Beginning Balance 209,843 151,342
Included in Operations 13,520 1,027
Included in Other Comprehensive Income (Loss) 0 0
Included in Operations (57,210) (18,675)
Included in Other Comprehensive Income (Loss) 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (4,072) 0
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 162,081 133,694
Total Gains (losses) included in Operations related to Instruments still held at the  Reporting Date $ (47,762) $ (17,648)