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FAIR VALUE OF FINANCIAL INSTRUMENTS - Reconciliation of Fair Value Measurements for Level 3 (Details) - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Beginning Balance $ 1,374,044  
Issuances 0 $ 0
Settlements 0 0
Ending Balance 1,268,885 1,374,044
Liabilities:    
Beginning Balance 844,362 659,459
Total Realized and Unrealized Gains Included in Earnings 401,350 93,071
Total Realized Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (273,907) (286,119)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0
Purchases 0 0
Sales 0 0
Issuances 623 623
Settlements 11,481 8,768
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 706,061 844,362
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 130,948 (189,047)
Annuity account    
Liabilities:    
Beginning Balance 83,472 87,616
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (3,505) (4,001)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0
Purchases 0 0
Sales 0 0
Issuances 623 623
Settlements 11,481 8,768
Transfers in/out of Level 3 0 0
Other 0 0
Ending Balance 76,119 83,472
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Other liabilities    
Liabilities:    
Beginning Balance 760,890 571,843
Total Realized and Unrealized Gains Included in Earnings 401,350 93,071
Total Realized Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (270,402) (282,118)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 629,942 760,890
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 130,948 (189,047)
Total investments    
Assets:    
Beginning Balance 1,374,044 1,510,043
Total Realized and Unrealized Gains Included in Earnings 55,761 32,438
Total Realized and Unrealized Gains Included in Other Comprehensive Income 29,090 42,908
Total Realized and Unrealized Losses Included in Earnings (79,016) (19,324)
Total Realized and Unrealized Losses Included in Other Comprehensive Income (58,085) (24,073)
Purchases 189,100 143,784
Sales (194,634) (281,289)
Transfers in/out of Level 3 (46,006) (28,937)
Other (1,369) (1,506)
Ending Balance 1,268,885 1,374,044
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (26,658) 15,209
Residential mortgage-backed securities | Available-for-sale securities    
Assets:    
Beginning Balance 0 3
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 83
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (995) 0
Purchases 22,225 11,862
Sales 0 (3)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 (21,281) (11,944)
Other 51 (1)
Ending Balance 0 0
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Residential mortgage-backed securities | Trading securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 50 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (2,496) 0
Purchases 48,621 0
Sales (293) 0
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 (45,832) 0
Other (50) 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 | Trading securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 504,365 562,604
Total Realized and Unrealized Gains Included in Earnings 3,716 1,409
Total Realized and Unrealized Gains Included in Other Comprehensive Income 16,503 15,136
Total Realized and Unrealized Losses Included in Earnings (159) 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (25,577) (10,931)
Purchases 0 100
Sales (80,051) (59,175)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 222 (6,643)
Other 2,623 1,865
Ending Balance 421,642 504,365
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 35,222 84,563
Total Realized and Unrealized Gains Included in Earnings 464 3,768
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (3,798) (1,157)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0
Purchases 8,728 0
Sales (14,511) (52,835)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 164 0
Other (213) 883
Ending Balance 26,056 35,222
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (3,179) 3,483
U.S. government-related securities | Available-for-sale securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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
U.S. government-related securities | Trading securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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
States, municipals, and political subdivisions | Available-for-sale securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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
States, municipals, and political subdivisions | Trading securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 government-related securities | Available-for-sale securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 government-related securities | Trading securities    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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
Corporate securities | Available-for-sale securities    
Assets:    
Beginning Balance 626,901 664,046
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 12,537 27,637
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (29,017) (13,089)
Purchases 108,491 131,822
Sales (97,676) (169,002)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 20,721 (10,353)
Other (3,681) (4,160)
Ending Balance 638,276 626,901
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Corporate securities | Trading securities    
Assets:    
Beginning Balance 5,442 5,492
Total Realized and Unrealized Gains Included in Earnings 45 101
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (145) (58)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0
Purchases 999 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 0
Other (99) (93)
Ending Balance 6,242 5,442
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (101) 44
Fixed maturities    
Assets:    
Beginning Balance 1,171,930 1,316,708
Total Realized and Unrealized Gains Included in Earnings 4,225 5,278
Total Realized and Unrealized Gains Included in Other Comprehensive Income 29,090 42,856
Total Realized and Unrealized Losses Included in Earnings (4,102) (1,215)
Total Realized and Unrealized Losses Included in Other Comprehensive Income (58,085) (24,020)
Purchases 189,064 143,784
Sales (192,531) (281,015)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 (46,006) (28,940)
Other (1,369) (1,506)
Ending Balance 1,092,216 1,171,930
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (3,280) 3,527
Fixed maturities | Available-for-sale securities    
Assets:    
Beginning Balance 1,131,266 1,226,653
Total Realized and Unrealized Gains Included in Earnings 3,716 1,409
Total Realized and Unrealized Gains Included in Other Comprehensive Income 29,090 42,856
Total Realized and Unrealized Losses Included in Earnings (159) 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (58,085) (24,020)
Purchases 179,337 143,784
Sales (178,020) (228,180)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 (46,170) (28,940)
Other (1,057) (2,296)
Ending Balance 1,059,918 1,131,266
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0
Fixed maturities | Trading securities    
Assets:    
Beginning Balance 40,664 90,055
Total Realized and Unrealized Gains Included in Earnings 509 3,869
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (3,943) (1,215)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0
Purchases 9,727 0
Sales (14,511) (52,835)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 164 0
Other (312) 790
Ending Balance 32,298 40,664
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (3,280) 3,527
Equity securities    
Assets:    
Beginning Balance 66,110 69,010
Total Realized and Unrealized Gains Included in Earnings 375 2
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 52
Total Realized and Unrealized Losses Included in Earnings (93) (2,630)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 (53)
Purchases 36 0
Sales (2,103) (274)
Issuances 0 0
Settlements 0 0
Transfers in/out of Level 3 0 3
Other 0 0
Ending Balance 64,325 66,110
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 282 3
Other long-term investments    
Assets:    
Beginning Balance 136,004 124,325
Total Realized and Unrealized Gains Included in Earnings 51,161 27,158
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings (74,821) (15,479)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 112,344 136,004
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (23,660) 11,679
Short-term investments    
Assets:    
Beginning Balance 0 0
Total Realized and Unrealized Gains Included in Earnings 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0
Total Realized and Unrealized Losses Included in Earnings 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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