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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 $ 1,337,537 $ 1,412,355 $ 1,306,979 $ 1,397,914
Included in Earnings 23,722 5,996 28,493 22,599
Included in Other Comprehensive Income 27,900 17,015 54,632 18,928
Included in Earnings (16,252) (14,748) (35,107) (15,387)
Included in Other Comprehensive Income (4,965) (8,582) (8,308) (22,317)
Purchases 677,645 118,973 727,108 153,973
Sales (56,977) (26,193) (101,905) (50,238)
Issuances 0 0 0 0
Settlements (1,708) (627) (1,708) (627)
Transfers in/out of Level 3 48,553 (7,509) 65,522 (7,509)
Other 255 (908) 4 (1,564)
Ending Balance 2,035,710 1,495,772 2,035,710 1,495,772
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 5,814 (9,394) (7,914) 6,521
Liabilities:        
Beginning Balance 681,268 569,995 514,246 681,034
Included in Earnings 364 68,621 830 188,110
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (199,365) (38,092) (368,686) (49,409)
Included in Other Comprehensive Income 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 914,620 537,106 914,620 537,106
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (198,176) 31,588 (366,704) 140,554
Annuity account balances        
Liabilities:        
Beginning Balance 74,613 81,399 76,119 83,472
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (825) (1,059) (1,152) (1,853)
Included in Other Comprehensive Income 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 606,655 488,596 438,127 597,562
Included in Earnings 364 68,621 830 188,110
Included in Other Comprehensive Income 0 0 0
Included in Earnings (198,540) (37,033) (367,534) (47,556)
Included in Other Comprehensive Income 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 842,035 457,008 842,035 457,008
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (198,176) 31,588 (366,704) 140,554
Total investments        
Assets:        
Beginning Balance 1,337,537 1,412,355 1,306,979 1,397,914
Included in Earnings 23,722 5,996 28,493 22,599
Included in Other Comprehensive Income 27,900 17,015 54,632 18,928
Included in Earnings (16,252) (14,748) (35,107) (15,387)
Included in Other Comprehensive Income (4,965) (8,582) (8,308) (22,317)
Purchases 677,645 118,973 727,108 153,973
Sales (56,977) (26,193) (101,905) (50,238)
Issuances 0 0 0 0
Settlements (1,708) (627) (1,708) (627)
Transfers in/out of Level 3 48,553 (7,509) 65,522 (7,509)
Other 255 (908) 4 (1,564)
Ending Balance 2,035,710 1,495,772 2,035,710 1,495,772
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 5,814 (9,394) (7,914) 6,521
Fixed maturities        
Assets:        
Beginning Balance 1,140,434 1,170,480 1,092,216 1,171,930
Included in Earnings 960 0 4,703 194
Included in Other Comprehensive Income 27,900 17,015 54,632 18,928
Included in Earnings (3,505) (3,615) (3,672) (3,737)
Included in Other Comprehensive Income (4,965) (8,582) (8,308) (22,317)
Purchases 670,986 118,937 720,449 153,937
Sales (56,977) (26,193) (101,905) (50,238)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 48,553 (7,509) 65,522 (7,509)
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)
Fixed maturities | Available-for-sale securities        
Assets:        
Beginning Balance 1,068,699 1,130,198 1,059,918 1,131,266
Included in Earnings 82 0 528 0
Included in Other Comprehensive Income 27,900 17,015 54,632 18,928
Included in Earnings (37) 0 (57) 0
Included in Other Comprehensive Income (4,965) (8,582) (8,308) (22,317)
Purchases 670,986 114,337 704,986 149,337
Sales (56,197) (14,920) (94,978) (38,569)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 49,350 (7,673) 39,255 (7,673)
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
Fixed maturities | Trading securities        
Assets:        
Beginning Balance 71,735 40,282 32,298 40,664
Included in Earnings 878 0 4,175 194
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (3,468) (3,615) (3,615) (3,737)
Included in Other Comprehensive Income 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)
Residential mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 0 0 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 (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
Commercial mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 0 0 0 0
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 16 0 16 0
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income 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
Other asset-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 420,091 503,789 421,642 504,365
Included in Earnings 0 0 446 0
Included in Other Comprehensive Income 2,513 11,353 10,660 11,867
Included in Earnings (37) 0 (57) 0
Included in Other Comprehensive Income (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
Other asset-backed securities | Trading securities        
Assets:        
Beginning Balance 66,484 34,958 26,056 35,222
Included in Earnings 810 0 4,006 194
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (3,468) (3,570) (3,584) (3,598)
Included in Other Comprehensive Income 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)
Corporate securities | Available-for-sale securities        
Assets:        
Beginning Balance 648,608 626,409 638,276 626,901
Included in Earnings 82 0 82 0
Included in Other Comprehensive Income 25,371 5,662 43,956 7,061
Included in Earnings 0 0 0 0
Included in Other Comprehensive Income (497) (6,828) (3,509) (18,929)
Purchases 661,627 43,491 695,627 78,491
Sales (56,183) (14,817) (84,956) (38,452)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 49,350 (7,895) 39,255 (7,895)
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
Corporate securities | Trading securities        
Assets:        
Beginning Balance 5,251 5,324 6,242 5,442
Included in Earnings 68 0 169 0
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings 0 (45) (31) (139)
Included in Other Comprehensive Income 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)
Equity securities        
Assets:        
Beginning Balance 63,409 65,516 63,421 65,518
Included in Earnings 0 1 1 1
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (3) 0 (16) (1)
Included in Other Comprehensive Income 0 0 0 0
Purchases 5,080 36 5,080 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 (1)
Ending Balance 68,486 65,553 68,486 65,553
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 133,694 176,359 151,342 160,466
Included in Earnings 22,762 5,995 23,789 22,404
Included in Other Comprehensive Income 0 0 0 0
Included in Earnings (12,744) (11,133) (31,419) (11,649)
Included in Other Comprehensive Income 0 0 0 0
Purchases 1,579 0 1,579 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (1,708) (627) (1,708) (627)
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 143,583 170,594 143,583 170,594
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date $ 8,310 $ (5,765) $ (9,338) $ 10,128