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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Assets:        
Beginning Balance $ 1,314,360 $ 1,380,893 $ 1,268,885 $ 1,374,044
Total Realized and Unrealized Gains, Included in Earnings, Assets 14,817 12,822 31,864 21,880
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 27,900 17,015 54,632 18,928
Total Realized and Unrealized Losses, Included in Earnings, Assets (17,396) (4,129) (33,610) (4,816)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (4,965) (8,582) (8,308) (22,317)
Purchases 677,644 118,973 727,107 153,973
Sales (56,977) (26,194) (101,905) (50,239)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 48,553 (7,508) 65,522 (7,508)
Other 255 (908) 4 (1,563)
Ending Balance 2,004,191 1,482,382 2,004,191 1,482,382
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (2,684) 8,693 (1,576) 17,063
Liabilities:        
Beginning Balance 872,504 702,501 706,061 844,362
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 364 96,138 12,034 257,456
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (263,171) (49,011) (443,117) (71,335)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Purchases 37,204 0 37,204 0
Sales 0 0 0 0
Issuances 56 89 67 530
Settlements 2,909 2,449 4,753 5,757
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 1,169,662 653,014 1,169,662 653,014
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (261,982) 48,186 (429,931) 187,974
Annuity account        
Liabilities:        
Beginning Balance 74,613 81,399 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 (825) (1,059) (1,152) (1,853)
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 56 89 67 530
Settlements 2,909 2,449 4,753 5,757
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 72,585 80,098 72,585 80,098
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0 0 0
Other liabilities        
Liabilities:        
Beginning Balance 797,891 621,102 629,942 760,890
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 364 96,138 12,034 257,456
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (262,346) (47,952) (441,965) (69,482)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Purchases 37,204 0 37,204 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 1,097,077 572,916 1,097,077 572,916
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (261,982) 48,186 (429,931) 187,974
Total investments        
Assets:        
Beginning Balance 1,314,360 1,380,893 1,268,885 1,374,044
Total Realized and Unrealized Gains, Included in Earnings, Assets 14,817 12,822 31,864 21,880
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 27,900 17,015 54,632 18,928
Total Realized and Unrealized Losses, Included in Earnings, Assets (17,396) (4,129) (33,610) (4,816)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (4,965) (8,582) (8,308) (22,317)
Purchases 677,644 118,973 727,107 153,973
Sales (56,977) (26,194) (101,905) (50,239)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 48,553 (7,508) 65,522 (7,508)
Other 255 (908) 4 (1,563)
Ending Balance 2,004,191 1,482,382 2,004,191 1,482,382
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (2,684) 8,693 (1,576) 17,063
Fixed maturities        
Assets:        
Beginning Balance 1,140,434 1,170,480 1,092,216 1,171,930
Total Realized and Unrealized Gains, Included in Earnings, Assets 960 0 4,703 194
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 27,900 17,015 54,632 18,928
Total Realized and Unrealized Losses, Included in Earnings, Assets (3,505) (3,615) (3,672) (3,737)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (4,965) (8,582) (8,308) (22,317)
Purchases 670,986 118,937 720,449 153,937
Sales (56,977) (26,194) (101,905) (50,239)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 48,553 (7,508) 65,522 (7,508)
Other 255 (908) 4 (1,563)
Ending Balance 1,823,641 1,259,625 1,823,641 1,259,625
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (2,649) (3,615) 1,202 (3,544)
Equity securities        
Assets:        
Beginning Balance 64,394 66,061 64,325 66,110
Total Realized and Unrealized Gains, Included in Earnings, Assets 157 1 239 1
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (3) (15) (16) (64)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 5,079 36 5,079 36
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 69,627 66,083 69,627 66,083
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 153 (14) 222 (63)
Other long-term investments        
Assets:        
Beginning Balance 109,532 144,352 112,344 136,004
Total Realized and Unrealized Gains, Included in Earnings, Assets 13,700 12,821 26,922 21,685
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (13,888) (499) (29,922) (1,015)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 1,579 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 110,923 156,674 110,923 156,674
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (188) 12,322 (3,000) 20,670
Available-for-sale securities | Fixed maturities        
Assets:        
Beginning Balance 1,068,699 1,130,198 1,059,918 1,131,266
Total Realized and Unrealized Gains, Included in Earnings, Assets 82 0 528 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 27,900 17,015 54,632 18,928
Total Realized and Unrealized Losses, Included in Earnings, Assets (37) 0 (57) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (4,965) (8,582) (8,308) (22,317)
Purchases 670,986 114,337 704,986 149,337
Sales (56,197) (14,921) (94,978) (38,570)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 49,350 (7,672) 39,255 (7,672)
Other 349 (856) 191 (1,453)
Ending Balance 1,756,167 1,229,519 1,756,167 1,229,519
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 0 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 (457) 0 (457)
Purchases 0 22,225 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 0 0 0
Other 0 12 0 12
Ending Balance 0 21,780 0 21,780
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 0 0 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 16 0 16 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 (1,284) 0 (1,284)
Purchases 9,359 48,621 9,359 48,621
Sales (7) (94) (7) (94)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 0
Other (2) (16) (2) (16)
Ending Balance 9,366 47,227 9,366 47,227
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 420,091 503,789 421,642 504,365
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 446 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 2,513 11,353 10,660 11,867
Total Realized and Unrealized Losses, Included in Earnings, Assets (37) 0 (57) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (4,468) (13) (4,799) (1,647)
Purchases 0 0 0 0
Sales (7) (9) (10,015) (23)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 222 0 222
Other 218 359 433 917
Ending Balance 418,310 515,701 418,310 515,701
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 648,608 626,409 638,276 626,901
Total Realized and Unrealized Gains, Included in Earnings, Assets 82 0 82 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 25,371 5,662 43,956 7,061
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (497) (6,828) (3,509) (18,929)
Purchases 661,627 43,491 695,627 78,491
Sales (56,183) (14,818) (84,956) (38,453)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 49,350 (7,894) 39,255 (7,894)
Other 133 (1,211) (240) (2,366)
Ending Balance 1,328,491 644,811 1,328,491 644,811
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 71,735 40,282 32,298 40,664
Total Realized and Unrealized Gains, Included in Earnings, Assets 878 0 4,175 194
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (3,468) (3,615) (3,615) (3,737)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 4,600 15,463 4,600
Sales (780) (11,273) (6,927) (11,669)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (797) 164 26,267 164
Other (94) (52) (187) (110)
Ending Balance 67,474 30,106 67,474 30,106
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (2,649) (3,615) 1,202 (3,544)
Trading securities | Other asset-backed securities        
Assets:        
Beginning Balance 66,484 34,958 26,056 35,222
Total Realized and Unrealized Gains, Included in Earnings, Assets 810 0 4,006 194
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (3,468) (3,570) (3,584) (3,598)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 4,600 15,463 4,600
Sales (781) (11,273) (5,892) (11,669)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (797) 164 26,267 164
Other (68) (27) (136) (61)
Ending Balance 62,180 24,852 62,180 24,852
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (2,717) (3,570) 1,068 (3,405)
Trading securities | Corporate securities        
Assets:        
Beginning Balance 5,251 5,324 6,242 5,442
Total Realized and Unrealized Gains, Included in Earnings, Assets 68 0 169 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 (45) (31) (139)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 0 0 0
Sales 1 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 (26) (25) (51) (49)
Ending Balance 5,294 5,254 5,294 5,254
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date $ 68 $ (45) $ 134 $ (139)