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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, 2019
Mar. 31, 2018
Assets:    
Beginning Balance $ 1,306,979 $ 1,397,914
Total Realized and Unrealized Gains, Included in Earnings, Assets 4,771 16,603
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 26,732 1,913
Total Realized and Unrealized Losses, Included in Earnings, Assets (18,855) (639)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,343) (13,735)
Purchases 49,463 35,000
Sales (44,928) (24,045)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 16,969 0
Other (251) (656)
Ending Balance 1,337,537 1,412,355
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (12,215) 15,916
Liabilities:    
Beginning Balance 514,246 681,034
Total Realized and Unrealized Gains Included in Earnings 466 119,489
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (169,320) (11,317)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0
Purchases 0 0
Sales 0 0
Issuances 11 441
Settlements 1,843 3,308
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 681,268 569,995
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (168,528) 108,966
Annuity account balances    
Liabilities:    
Beginning Balance 76,119 83,472
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (326) (794)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0 0
Purchases 0 0
Sales 0 0
Issuances 11 441
Settlements 1,843 3,308
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 74,613 81,399
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Other liabilities    
Liabilities:    
Beginning Balance 438,127 597,562
Total Realized and Unrealized Gains Included in Earnings 466 119,489
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (168,994) (10,523)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Liabilities 0
Purchases 0
Sales 0
Issuances 0
Settlements 0
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 606,655 488,596
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (168,528) 108,966
Total investments    
Assets:    
Beginning Balance 1,306,979 1,397,914
Total Realized and Unrealized Gains, Included in Earnings, Assets 4,771 16,603
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 26,732 1,913
Total Realized and Unrealized Losses, Included in Earnings, Assets (18,855) (639)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,343) (13,735)
Purchases 49,463 35,000
Sales (44,928) (24,045)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 16,969 0
Other (251) (656)
Ending Balance 1,337,537 1,412,355
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (12,215) 15,916
Fixed maturities    
Assets:    
Beginning Balance 1,092,216 1,171,930
Total Realized and Unrealized Gains, Included in Earnings, Assets 3,743 194
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 26,732 1,913
Total Realized and Unrealized Losses, Included in Earnings, Assets (167) (122)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,343) (13,735)
Purchases 49,463 35,000
Sales (44,928) (24,045)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 16,969 0
Other (251) (655)
Ending Balance 1,140,434 1,170,480
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 5,364 72
Fixed maturities | Available-for-sale securities    
Assets:    
Beginning Balance 1,059,918 1,131,266
Total Realized and Unrealized Gains, Included in Earnings, Assets 446 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 26,732 1,913
Total Realized and Unrealized Losses, Included in Earnings, Assets (20) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,343) (13,735)
Purchases 34,000 35,000
Sales (38,781) (23,649)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 (10,095) 0
Other (158) (597)
Ending Balance 1,068,699 1,130,198
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Fixed maturities | Trading securities    
Assets:    
Beginning Balance 32,298 40,664
Total Realized and Unrealized Gains, Included in Earnings, Assets 3,297 194
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (147) (122)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0
Purchases 15,463 0
Sales (6,147) (396)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 27,064 0
Other (93) (58)
Ending Balance 71,735 40,282
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 5,364 72
Residential mortgage-backed securities | Available-for-sale securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 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 Earnings related to Instruments still held at the Reporting Date 0 0
Commercial mortgage-backed securities | Available-for-sale securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 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 Earnings related to Instruments still held at the Reporting Date 0 0
Other asset-backed securities | Available-for-sale securities    
Assets:    
Beginning Balance 421,642 504,365
Total Realized and Unrealized Gains, Included in Earnings, Assets 446 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 8,147 514
Total Realized and Unrealized Losses, Included in Earnings, Assets (20) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (331) (1,634)
Purchases 0 0
Sales (10,008) (14)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 0
Other 215 558
Ending Balance 420,091 503,789
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Other asset-backed securities | Trading securities    
Assets:    
Beginning Balance 26,056 35,222
Total Realized and Unrealized Gains, Included in Earnings, Assets 3,196 194
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (116) (28)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0
Purchases 15,463 0
Sales (5,111) (396)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 27,064 0
Other (68) (34)
Ending Balance 66,484 34,958
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 5,330 166
Corporate securities | Available-for-sale securities    
Assets:    
Beginning Balance 638,276 626,901
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 18,585 1,399
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (3,012) (12,101)
Purchases 34,000 35,000
Sales (28,773) (23,635)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 (10,095) 0
Other (373) (1,155)
Ending Balance 648,608 626,409
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Corporate securities | Trading securities    
Assets:    
Beginning Balance 6,242 5,442
Total Realized and Unrealized Gains, Included in Earnings, Assets 101 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (31) (94)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0
Purchases 0 0
Sales (1,036) 0
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 0
Other (25) (24)
Ending Balance 5,251 5,324
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 34 (94)
Equity securities    
Assets:    
Beginning Balance 63,421 65,518
Total Realized and Unrealized Gains, Included in Earnings, Assets 1 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (13) (1)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 0
Other 0 (1)
Ending Balance 63,409 65,516
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 69 (49)
Other long-term investments    
Assets:    
Beginning Balance 151,342 160,466
Total Realized and Unrealized Gains, Included in Earnings, Assets 1,027 16,409
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (18,675) (516)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 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 133,694 176,359
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date $ (17,648) $ 15,893