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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Assets:        
Beginning Balance $ 1,482,382 $ 1,474,245 $ 1,374,044 $ 1,510,043
Total Realized and Unrealized Gains, Included in Earnings, Assets 25,243 10,358 47,123 25,232
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 1,439 10,097 20,367 31,446
Total Realized and Unrealized Losses, Included in Earnings, Assets (144) (355) (4,960) (19,209)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (20,596) (4,507) (42,913) (10,137)
Purchases 19,128 5,171 173,101 97,784
Sales (51,138) (61,708) (101,377) (190,120)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (27,750) (17,430) (35,258) (28,937)
Other 497 (641) (1,066) (872)
Ending Balance 1,429,061 1,415,230 1,429,061 1,415,230
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 25,221 10,148 42,284 9,527
Liabilities:        
Beginning Balance 653,014 788,312 844,362 659,459
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 70,887 12,201 328,343 56,464
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (53,347) (47,373) (124,682) (224,007)
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 40 9 570 402
Settlements 2,571 2,052 8,328 5,963
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 632,943 821,441 632,943 821,441
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 18,436 (34,195) 206,410 (164,570)
Annuity account        
Liabilities:        
Beginning Balance 80,098 86,094 83,472 87,616
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 (896) (977) (2,749) (2,973)
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 40 9 570 402
Settlements 2,571 2,052 8,328 5,963
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 78,463 85,028 78,463 85,028
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0 0 0
Other liabilities        
Liabilities:        
Beginning Balance 572,916 702,218 760,890 571,843
Total Realized and Unrealized Gains, Included in Earnings, Liabilities 70,887 12,201 328,343 56,464
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Liabilities 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Liabilities (52,451) (46,396) (121,933) (221,034)
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 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 554,480 736,413 554,480 736,413
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 18,436 (34,195) 206,410 (164,570)
Total investments        
Assets:        
Beginning Balance 1,482,382 1,474,245 1,374,044 1,510,043
Total Realized and Unrealized Gains, Included in Earnings, Assets 25,243 10,358 47,123 25,232
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 1,439 10,097 20,367 31,446
Total Realized and Unrealized Losses, Included in Earnings, Assets (144) (355) (4,960) (19,209)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (20,596) (4,507) (42,913) (10,137)
Purchases 19,128 5,171 173,101 97,784
Sales (51,138) (61,708) (101,377) (190,120)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (27,750) (17,430) (35,258) (28,937)
Other 497 (641) (1,066) (872)
Ending Balance 1,429,061 1,415,230 1,429,061 1,415,230
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 25,221 10,148 42,284 9,527
Fixed maturities        
Assets:        
Beginning Balance 1,259,625 1,287,922 1,171,930 1,316,708
Total Realized and Unrealized Gains, Included in Earnings, Assets 84 27 278 3,780
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 1,439 10,066 20,367 31,394
Total Realized and Unrealized Losses, Included in Earnings, Assets (144) (353) (3,881) (1,154)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (20,596) (4,507) (42,913) (10,137)
Purchases 19,128 5,171 173,065 97,784
Sales (49,036) (61,539) (99,275) (189,847)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (27,750) (17,430) (35,258) (28,940)
Other 497 (641) (1,066) (872)
Ending Balance 1,183,247 1,218,716 1,183,247 1,218,716
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 62 (182) (3,482) 3,498
Equity securities        
Assets:        
Beginning Balance 66,083 66,300 66,110 69,010
Total Realized and Unrealized Gains, Included in Earnings, Assets 287 0 288 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 31 0 52
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 (64) (2,630)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 0 36 0
Sales (2,102) (169) (2,102) (273)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 3
Other 0 0 0 0
Ending Balance 64,268 66,162 64,268 66,162
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 287 1 224 2
Other long-term investments        
Assets:        
Beginning Balance 156,674 120,023 136,004 124,325
Total Realized and Unrealized Gains, Included in Earnings, Assets 24,872 10,331 46,557 21,452
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 (2) (1,015) (15,425)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 0 0 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 181,546 130,352 181,546 130,352
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 24,872 10,329 45,542 6,027
Short-term investments        
Assets:        
Total Realized and Unrealized Gains, Included in Earnings, Assets     0  
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets     0  
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets     0  
Issuances     0  
Settlements     0  
Available-for-sale securities | Fixed maturities        
Assets:        
Beginning Balance 1,229,519 1,227,479 1,131,266 1,226,653
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 1,439 10,066 20,367 31,394
Total Realized and Unrealized Losses, Included in Earnings, Assets (62) 0 (62) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (20,596) (4,507) (42,913) (10,137)
Purchases 15,000 5,171 164,337 97,784
Sales (48,110) (42,351) (86,680) (137,331)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (27,750) (17,430) (35,422) (28,940)
Other 572 (726) (881) (1,721)
Ending Balance 1,150,012 1,177,702 1,150,012 1,177,702
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 21,780 11,862 0 3
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 83 0 83
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (538) 0 (995) 0
Purchases 0 0 22,225 11,862
Sales 0 0 0 (3)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (21,281) (11,944) (21,281) (11,944)
Other 39 (1) 51 (1)
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
Available-for-sale securities | Commercial mortgage-backed securities        
Assets:        
Beginning Balance 47,227 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 (1,212) 0 (2,496) 0
Purchases 0 0 48,621 0
Sales (151) 0 (245) 0
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (26,372) 0 (26,372) 0
Other (25) 0 (41) 0
Ending Balance 19,467 0 19,467 0
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 515,701 552,963 504,365 562,604
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 17 1,682 11,884 5,212
Total Realized and Unrealized Losses, Included in Earnings, Assets (62) 0 (62) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (14,802) (2,285) (16,449) (7,373)
Purchases 0 100 0 100
Sales (24) (109) (47) (2,136)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 222 (6,643)
Other 1,431 798 2,348 1,385
Ending Balance 502,261 553,149 502,261 553,149
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 644,811 662,654 626,901 664,046
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 1,422 8,301 8,483 26,099
Total Realized and Unrealized Losses, Included in Earnings, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets (4,044) (2,222) (22,973) (2,764)
Purchases 15,000 5,071 93,491 85,822
Sales (47,935) (42,242) (86,388) (135,192)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 19,903 (5,486) 12,009 (10,353)
Other (873) (1,523) (3,239) (3,105)
Ending Balance 628,284 624,553 628,284 624,553
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 30,106 60,443 40,664 90,055
Total Realized and Unrealized Gains, Included in Earnings, Assets 84 27 278 3,780
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (82) (353) (3,819) (1,154)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 4,128 0 8,728 0
Sales (926) (19,188) (12,595) (52,516)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 164 0
Other (75) 85 (185) 849
Ending Balance 33,235 41,014 33,235 41,014
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 62 (182) (3,482) 3,498
Trading securities | Other asset-backed securities        
Assets:        
Beginning Balance 24,852 54,923 35,222 84,563
Total Realized and Unrealized Gains, Included in Earnings, Assets 84 0 278 3,679
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (76) (353) (3,674) (1,154)
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 4,128 0 8,728 0
Sales (926) (19,188) (12,595) (52,516)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 164 0
Other (50) 108 (111) 918
Ending Balance 28,012 35,490 28,012 35,490
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 68 (209) (3,337) 3,397
Trading securities | Corporate securities        
Assets:        
Beginning Balance 5,254 5,520 5,442 5,492
Total Realized and Unrealized Gains, Included in Earnings, Assets 0 27 0 101
Total Realized and Unrealized Gains, Included in Other Comprehensive Income, Assets 0 0 0 0
Total Realized and Unrealized Losses, Included in Earnings, Assets (6) 0 (145) 0
Total Realized and Unrealized Losses, Included in Other Comprehensive Income, Assets 0 0 0 0
Purchases 0 0 0 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 (25) (23) (74) (69)
Ending Balance 5,223 5,524 5,223 5,524
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date $ (6) $ 27 $ (145) $ 101