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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Assets:        
Beginning Balance $ 2,004,191 $ 1,482,382 $ 1,268,885 $ 1,374,044
Total Realized and Unrealized Gains, Included in Earnings, Assets 57,590 25,243 89,454 47,123
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 24,069 1,439 78,701 20,367
Total Realized and Unrealized Losses, Included in Earnings, Assets (49) (144) (33,659) (4,960)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (6,684) (20,596) (14,992) (42,913)
Purchases 10,850 19,128 737,957 173,101
Sales (73,121) (51,138) (175,026) (101,377)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 41,319 (27,750) 106,841 (35,258)
Other (1,015) 497 (1,011) (1,066)
Ending Balance 2,057,150 1,429,061 2,057,150 1,429,061
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 64,408 25,221 57,214 42,284
Liabilities:        
Beginning Balance 1,169,662 653,014 706,061 844,362
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 0 70,887 12,034 328,343
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (344,714) (53,347) (787,831) (124,682)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Purchases 33,684 0 70,888 0
Sales 0 0 0 0
Issuances 91 40 158 570
Settlements 1,379 2,571 6,132 8,328
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 1,546,772 632,943 1,546,772 632,943
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date (344,191) 18,436 (774,122) 206,410
Annuity account        
Liabilities:        
Beginning Balance 72,585 80,098 76,119 83,472
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 0 0 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (523) (896) (1,675) (2,749)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 91 40 158 570
Settlements 1,379 2,571 6,132 8,328
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 71,820 78,463 71,820 78,463
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 0 0 0 0
Other liabilities        
Liabilities:        
Beginning Balance 1,097,077 572,916 629,942 760,890
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 0 70,887 12,034 328,343
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (344,191) (52,451) (786,156) (121,933)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Purchases 33,684 0 70,888 0
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 1,474,952 554,480 1,474,952 554,480
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date (344,191) 18,436 (774,122) 206,410
Total investments        
Assets:        
Beginning Balance 2,004,191 1,482,382 1,268,885 1,374,044
Total Realized and Unrealized Gains, Included in Earnings, Assets 57,590 25,243 89,454 47,123
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 24,069 1,439 78,701 20,367
Total Realized and Unrealized Losses, Included in Earnings, Assets (49) (144) (33,659) (4,960)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (6,684) (20,596) (14,992) (42,913)
Purchases 10,850 19,128 737,957 173,101
Sales (73,121) (51,138) (175,026) (101,377)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 41,319 (27,750) 106,841 (35,258)
Other (1,015) 497 (1,011) (1,066)
Ending Balance 2,057,150 1,429,061 2,057,150 1,429,061
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 64,408 25,221 57,214 42,284
Fixed maturities        
Assets:        
Beginning Balance 1,823,641 1,259,625 1,092,216 1,171,930
Total Realized and Unrealized Gains, Included in Earnings, Assets 361 84 5,064 278
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 24,069 1,439 78,701 20,367
Total Realized and Unrealized Losses, Included in Earnings, Assets (48) (144) (3,720) (3,881)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (6,684) (20,596) (14,992) (42,913)
Purchases 10,850 19,128 731,299 173,065
Sales (73,121) (49,036) (175,026) (99,275)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 41,319 (27,750) 106,841 (35,258)
Other (1,015) 497 (1,011) (1,066)
Ending Balance 1,819,372 1,183,247 1,819,372 1,183,247
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 7,180 62 2,832 (3,482)
Equity securities        
Assets:        
Beginning Balance 69,627 66,083 64,325 66,110
Total Realized and Unrealized Gains, Included in Earnings, Assets 192 287 431 288
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (1) 0 (17) (64)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 0 5,079 36
Sales 0 (2,102) 0 (2,102)
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 69,818 64,268 69,818 64,268
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 191 287 345 224
Other long-term investments        
Assets:        
Beginning Balance 110,923 156,674 112,344 136,004
Total Realized and Unrealized Gains, Included in Earnings, Assets 57,037 24,872 83,959 46,557
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 (29,922) (1,015)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 0 1,579 0
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 167,960 181,546 167,960 181,546
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 57,037 24,872 54,037 45,542
Available-for-sale securities | Fixed maturities        
Assets:        
Beginning Balance 1,756,167 1,229,519 1,059,918 1,131,266
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 528 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 24,069 1,439 78,701 20,367
Total Realized and Unrealized Losses, Included in Earnings, Assets (14) (62) (71) (62)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (6,684) (20,596) (14,992) (42,913)
Purchases 9,150 15,000 714,136 164,337
Sales (72,242) (48,110) (167,220) (86,680)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 41,319 (27,750) 80,574 (35,422)
Other (956) 572 (765) (881)
Ending Balance 1,750,809 1,150,012 1,750,809 1,150,012
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 0 0 0 0
Available-for-sale securities | Residential mortgage-backed securities        
Assets:        
Beginning Balance 0 21,780 0 0
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 (538) 0 (995)
Purchases 0 0 0 22,225
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 (21,281) 0 (21,281)
Other 0 39 0 51
Ending Balance 0 0 0 0
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 0 0 0 0
Available-for-sale securities | Commercial mortgage-backed securities        
Assets:        
Beginning Balance 9,366 47,227 0 0
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 294 0 310 0
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 (1,212) 0 (2,496)
Purchases 0 0 9,359 48,621
Sales (19) (151) (26) (245)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 (26,372) 0 (26,372)
Other (6) (25) (8) (41)
Ending Balance 9,635 19,467 9,635 19,467
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 0 0 0 0
Available-for-sale securities | Other asset-backed securities        
Assets:        
Beginning Balance 418,310 515,701 421,642 504,365
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 446 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 865 17 11,525 11,884
Total Realized and Unrealized Losses, Included in Earnings, Assets (14) (62) (71) (62)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,276) (14,802) (8,075) (16,449)
Purchases 0 0 0 0
Sales (8) (24) (10,023) (47)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 222
Other 185 1,431 618 2,348
Ending Balance 416,062 502,261 416,062 502,261
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 0 0 0 0
Available-for-sale securities | Corporate securities        
Assets:        
Beginning Balance 1,328,491 644,811 638,276 626,901
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 82 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 22,910 1,422 66,866 8,483
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,408) (4,044) (6,917) (22,973)
Purchases 9,150 15,000 704,777 93,491
Sales (72,215) (47,935) (157,171) (86,388)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 41,319 19,903 80,574 12,009
Other (1,135) (873) (1,375) (3,239)
Ending Balance 1,325,112 628,284 1,325,112 628,284
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 0 0 0 0
Trading securities | Fixed maturities        
Assets:        
Beginning Balance 67,474 30,106 32,298 40,664
Total Realized and Unrealized Gains, Included in Earnings, Assets 361 84 4,536 278
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (34) (82) (3,649) (3,819)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 1,700 4,128 17,163 8,728
Sales (879) (926) (7,806) (12,595)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 26,267 164
Other (59) (75) (246) (185)
Ending Balance 68,563 33,235 68,563 33,235
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 7,180 62 2,832 (3,482)
Trading securities | Other asset-backed securities        
Assets:        
Beginning Balance 62,180 24,852 26,056 35,222
Total Realized and Unrealized Gains, Included in Earnings, Assets 294 84 4,300 278
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (34) (76) (3,618) (3,674)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 4,128 15,463 8,728
Sales (879) (926) (6,771) (12,595)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 26,267 164
Other (34) (50) (170) (111)
Ending Balance 61,527 28,012 61,527 28,012
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 274 68 (2,442) (3,337)
Trading securities | Corporate securities        
Assets:        
Beginning Balance 5,294 5,254 6,242 5,442
Total Realized and Unrealized Gains, Included in Earnings, Assets 67 0 236 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 (6) (31) (145)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 1,700 0 1,700 0
Sales 0 0 (1,035) 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Other (25) (25) (76) (74)
Ending Balance 7,036 5,223 7,036 5,223
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date $ 6,906 $ (6) $ 5,274 $ (145)