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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Assets:        
Beginning Balance $ 1,412,355 $ 1,467,580 $ 1,397,914 $ 1,498,010
Total Realized and Unrealized Gains Included in Earnings 5,996 976 22,599 9,729
Total Realized and Unrealized Gains Included in Other Comprehensive Income 17,015 10,027 18,928 21,328
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (14,748) (11,596) (15,387) (29,048)
Total Realized and Unrealized Losses Included in Other Comprehensive Income (8,582) (4,517) (22,317) (5,630)
Purchases 118,973 55,354 153,973 92,613
Sales (26,193) (68,201) (50,238) (128,411)
Issuances 0 0 0 0
Settlements (627) 0 (627) 0
Transfers in/out of Level 3 (7,509) (2,220) (7,509) (11,507)
Other (908) (550) (1,564) (231)
Ending Balance 1,495,772 1,446,853 1,495,772 1,446,853
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (9,394) (10,414) 6,521 (18,599)
Liabilities:        
Beginning Balance 569,995 525,216 681,034 493,419
Total Realized and Unrealized Gains Included in Earnings 68,621 0 188,110 15,280
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Total Realized and Unrealized Losses Included in Earnings (38,092) (95,072) (49,409) (144,237)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 89 212 530 392
Settlements 2,449 1,643 5,757 3,911
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 537,106 618,857 537,106 618,857
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 31,588 (93,962) 140,554 (126,960)
Annuity account balances        
Liabilities:        
Beginning Balance 81,399 86,415 83,472 87,616
Total Realized and Unrealized Gains Included in Earnings 0 0 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Total Realized and Unrealized Losses Included in Earnings (1,059) (1,110) (1,853) (1,997)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 89 212 530 392
Settlements 2,449 1,643 5,757 3,911
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 80,098 86,094 80,098 86,094
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0 0 0
Other liabilities        
Liabilities:        
Beginning Balance 488,596 438,801 597,562 405,803
Total Realized and Unrealized Gains Included in Earnings 68,621 0 188,110 15,280
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Total Realized and Unrealized Losses Included in Earnings (37,033) (93,962) (47,556) (142,240)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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 457,008 532,763 457,008 532,763
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 31,588 (93,962) 140,554 (126,960)
Total investments        
Assets:        
Beginning Balance 1,412,355 1,467,580 1,397,914 1,498,010
Total Realized and Unrealized Gains Included in Earnings 5,996 976 22,599 9,729
Total Realized and Unrealized Gains Included in Other Comprehensive Income 17,015 10,027 18,928 21,328
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (14,748) (11,596) (15,387) (29,048)
Total Realized and Unrealized Losses Included in Other Comprehensive Income (8,582) (4,517) (22,317) (5,630)
Purchases 118,973 55,354 153,973 92,613
Sales (26,193) (68,201) (50,238) (128,411)
Issuances 0 0 0 0
Settlements (627) 0 (627) 0
Transfers in/out of Level 3 (7,509) (2,220) (7,509) (11,507)
Other (908) (550) (1,564) (231)
Ending Balance 1,495,772 1,446,853 1,495,772 1,446,853
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (9,394) (10,414) 6,521 (18,599)
Fixed maturities        
Assets:        
Beginning Balance 1,170,480 1,297,897 1,171,930 1,316,708
Total Realized and Unrealized Gains Included in Earnings 0 245 194 3,753
Total Realized and Unrealized Gains Included in Other Comprehensive Income 17,015 10,027 18,928 21,328
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (3,615) (215) (3,737) (801)
Total Realized and Unrealized Losses Included in Other Comprehensive Income (8,582) (4,517) (22,317) (5,630)
Purchases 118,937 55,354 153,937 92,613
Sales (26,193) (68,098) (50,238) (128,308)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (7,509) (2,220) (7,509) (11,510)
Other (908) (551) (1,563) (231)
Ending Balance 1,259,625 1,287,922 1,259,625 1,287,922
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (3,615) 236 (3,544) 3,672
Fixed maturities | Available-for-sale securities        
Assets:        
Beginning Balance 1,130,198 1,223,641 1,131,266 1,226,653
Total Realized and Unrealized Gains Included in Earnings 0 0 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 17,015 10,027 18,928 21,328
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 0 0 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (8,582) (4,517) (22,317) (5,630)
Purchases 114,337 55,354 149,337 92,613
Sales (14,920) (54,078) (38,569) (94,980)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (7,673) (2,220) (7,673) (11,510)
Other (856) (728) (1,453) (995)
Ending Balance 1,229,519 1,227,479 1,229,519 1,227,479
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 40,282 74,256 40,664 90,055
Total Realized and Unrealized Gains Included in Earnings 0 245 194 3,753
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (3,615) (215) (3,737) (801)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0 0 0
Purchases 4,600 0 4,600 0
Sales (11,273) (14,020) (11,669) (33,328)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 164 0 164 0
Other (52) 177 (110) 764
Ending Balance 30,106 60,443 30,106 60,443
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (3,615) 236 (3,544) 3,672
Residential mortgage-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 0 0 0 3
Total Realized and Unrealized Gains Included in Earnings 0 0 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 0 0 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (457) 0 (457) 0
Purchases 22,225 11,862 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 0 0 0 0
Other 12 0 12 0
Ending Balance 21,780 11,862 21,780 11,862
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  
Total Realized and Unrealized Gains Included in Earnings 0 0 0  
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 0 0 0  
Total Realized and Unrealized Losses Included in Other Comprehensive Income (1,284) 0 (1,284)  
Purchases 48,621 0 48,621  
Sales (94) 0 (94)  
Issuances 0 0 0  
Settlements 0 0 0  
Transfers in/out of Level 3 0 0 0  
Other (16) 0 (16)  
Ending Balance 47,227 0 47,227 0
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date 0 0 0  
Other asset-backed securities | Available-for-sale securities        
Assets:        
Beginning Balance 503,789 556,936 504,365 562,604
Total Realized and Unrealized Gains Included in Earnings 0 0 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 11,353 0 11,867 3,530
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 0 0 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (13) (4,257) (1,647) (5,088)
Purchases 0 0 0 0
Sales (9) (12) (23) (2,027)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 222 0 222 (6,643)
Other 359 296 917 587
Ending Balance 515,701 552,963 515,701 552,963
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 34,958 68,752 35,222 84,563
Total Realized and Unrealized Gains Included in Earnings 0 205 194 3,679
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (3,570) (215) (3,598) (801)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0 0 0
Purchases 4,600 0 4,600 0
Sales (11,273) (14,020) (11,669) (33,328)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 164 0 164 0
Other (27) 201 (61) 810
Ending Balance 24,852 54,923 24,852 54,923
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (3,570) 196 (3,405) 3,598
Corporate securities | Available-for-sale securities        
Assets:        
Beginning Balance 626,409 666,705 626,901 664,046
Total Realized and Unrealized Gains Included in Earnings 0 0 0 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 5,662 10,027 7,061 17,798
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 0 0 0 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income (6,828) (260) (18,929) (542)
Purchases 43,491 43,492 78,491 80,751
Sales (14,817) (54,066) (38,452) (92,950)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 (7,895) (2,220) (7,895) (4,867)
Other (1,211) (1,024) (2,366) (1,582)
Ending Balance 644,811 662,654 644,811 662,654
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 5,324 5,504 5,442 5,492
Total Realized and Unrealized Gains Included in Earnings 0 40 0 74
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (45) 0 (139) 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 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) (24) (49) (46)
Ending Balance 5,254 5,520 5,254 5,520
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (45) 40 (139) 74
Equity securities        
Assets:        
Beginning Balance 65,516 65,788 65,518 65,786
Total Realized and Unrealized Gains Included in Earnings 1 0 1 0
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 0 0 (1) 0
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0 0 0
Purchases 36 0 36 0
Sales 0 (103) 0 (103)
Issuances 0 0 0 0
Settlements 0 0 0 0
Transfers in/out of Level 3 0 0 0 3
Other 0 1 (1) 0
Ending Balance 65,553 65,686 65,553 65,686
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (14) 0 (63) 0
Other long-term investments        
Assets:        
Beginning Balance 176,359 103,895 160,466 115,516
Total Realized and Unrealized Gains Included in Earnings 5,995 731 22,404 5,976
Total Realized and Unrealized Gains Included in Other Comprehensive Income 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1 (11,133) (11,381) (11,649) (28,247)
Total Realized and Unrealized Losses Included in Other Comprehensive Income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (627) 0 (627) 0
Transfers in/out of Level 3 0 0 0 0
Other 0 0 0 0
Ending Balance 170,594 93,245 170,594 93,245
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date (5,765) (10,650) 10,128 0
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
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis Asset, Loss Included in Earnings1     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 0 0
Total Gains (losses) included in Earnings related to Instruments still held at the Reporting Date     $ 0 $ (22,271)