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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 $ 2,035,710 $ 1,495,772 $ 1,306,979 $ 1,397,914
Included in Earnings 49,818 11,983 78,311 34,582
Included in Other Comprehensive Income 24,069 1,439 78,701 20,367
Included in Earnings (50) (2,059) (35,156) (17,446)
Included in Other Comprehensive Income (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 (1,708) (627)
Transfers in/out of Level 3 41,319 (27,750) 106,841 (35,258)
Other (1,015) 497 (1,011) (1,067)
Ending Balance 2,080,896 1,427,276 2,080,896 1,427,276
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 56,828 10,333 43,296 16,854
Liabilities:        
Beginning Balance 914,620 537,106 514,246 681,034
Included in Earnings 0 38,249 830 226,359
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (192,095) (42,510) (560,781) (91,919)
Included in Other Comprehensive Income 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 1,139,111 538,836 1,139,111 538,836
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date (191,572) (3,365) (558,276) 137,189
Annuity account balances        
Liabilities:        
Beginning Balance 72,585 80,098 76,119 83,472
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (523) (896) (1,675) (2,749)
Included in Other Comprehensive Income 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 842,035 457,008 438,127 597,562
Included in Earnings 0 38,249 830 226,359
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (191,572) (41,614) (559,106) (89,170)
Included in Other Comprehensive Income 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 1,067,291 460,373 1,067,291 460,373
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date (191,572) (3,365) (558,276) 137,189
Total investments        
Assets:        
Beginning Balance 2,035,710 1,495,772 1,306,979 1,397,914
Included in Earnings 49,818 11,983 78,311 34,582
Included in Other Comprehensive Income 24,069 1,439 78,701 20,367
Included in Earnings (50) (2,059) (35,156) (17,446)
Included in Other Comprehensive Income (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 (1,708) (627)
Transfers in/out of Level 3 41,319 (27,750) 106,841 (35,258)
Other (1,015) 497 (1,011) (1,067)
Ending Balance 2,080,896 1,427,276 2,080,896 1,427,276
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date 56,828 10,333 43,296 16,854
Fixed maturities        
Assets:        
Beginning Balance 1,823,641 1,259,625 1,092,216 1,171,930
Included in Earnings 361 84 5,064 278
Included in Other Comprehensive Income 24,069 1,439 78,701 20,367
Included in Earnings (48) (144) (3,720) (3,881)
Included in Other Comprehensive Income (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)
Fixed maturities | Available-for-sale securities        
Assets:        
Beginning Balance 1,756,167 1,229,519 1,059,918 1,131,266
Included in Earnings 0 0 528 0
Included in Other Comprehensive Income 24,069 1,439 78,701 20,367
Included in Earnings (14) (62) (71) (62)
Included in Other Comprehensive Income (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
Fixed maturities | Trading securities        
Assets:        
Beginning Balance 67,474 30,106 32,298 40,664
Included in Earnings 361 84 4,536 278
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (34) (82) (3,649) (3,819)
Included in Other Comprehensive Income 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)
Residential mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 0 21,780 0 0
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 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
Commercial mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 9,366 47,227 0 0
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 294 0 310 0
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 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
Other asset-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 418,310 515,701 421,642 504,365
Included in Earnings 0 0 446 0
Included in Other Comprehensive Income 865 17 11,525 11,884
Included in Earnings (14) (62) (71) (62)
Included in Other Comprehensive Income (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
Other asset-backed securities | Trading securities        
Assets:        
Beginning Balance 62,180 24,852 26,056 35,222
Included in Earnings 294 84 4,300 278
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (34) (76) (3,618) (3,674)
Included in Other Comprehensive Income 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)
Corporate securities | Available-for-sale securities        
Assets:        
Beginning Balance 1,328,491 644,811 638,276 626,901
Included in Earnings 0 0 82 0
Included in Other Comprehensive Income 22,910 1,422 66,866 8,483
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income (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
Corporate securities | Trading securities        
Assets:        
Beginning Balance 5,294 5,254 6,242 5,442
Included in Earnings 67 0 236 0
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings 0 (6) (31) (145)
Included in Other Comprehensive Income 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)
Equity securities        
Assets:        
Beginning Balance 68,486 65,553 63,421 65,518
Included in Earnings 0 0 1 1
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (2) 0 (17) (1)
Included in Other Comprehensive Income 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 (1)
Ending Balance 68,484 63,451 68,484 63,451
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 143,583 170,594 151,342 160,466
Included in Earnings 49,457 11,899 73,246 34,303
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings 0 (1,915) (31,419) (13,564)
Included in Other Comprehensive Income 0 0 0 0
Purchases 0 0 1,579 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 (1,708) (627)
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 193,040 180,578 193,040 180,578
Total Gains (losses) included in Earnings related to Instruments still held at the  Reporting Date $ 49,457 $ 9,984 $ 40,119 $ 20,112