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INVESTMENTS (Fixed Maturities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fixed maturities    
Amortized Cost $ 11,911,889 $ 12,611,219
Gross Unrealized Gains 33,495 101,660
Gross Unrealized Losses (206,079) (90,873)
Fair Value 11,739,305 12,622,006
Non-credit OTTI in AOCI (884) (853)
U.S. government and agency    
Fixed maturities    
Amortized Cost 1,692,025 1,727,643
Gross Unrealized Gains 556 1,735
Gross Unrealized Losses (23,160) (16,909)
Fair Value 1,669,421 1,712,469
Non-credit OTTI in AOCI 0 0
Non-U.S. government    
Fixed maturities    
Amortized Cost 596,802 798,582
Gross Unrealized Gains 4,475 17,240
Gross Unrealized Losses (16,114) (9,523)
Fair Value 585,163 806,299
Non-credit OTTI in AOCI 0 0
Corporate debt    
Fixed maturities    
Amortized Cost 4,945,251 5,265,795
Gross Unrealized Gains 18,686 61,922
Gross Unrealized Losses (92,965) (29,851)
Fair Value 4,870,972 5,297,866
Non-credit OTTI in AOCI 0 0
Agency RMBS    
Fixed maturities    
Amortized Cost 1,738,740 2,414,720
Gross Unrealized Gains 3,903 8,132
Gross Unrealized Losses (42,915) (27,700)
Fair Value 1,699,728 2,395,152
Non-credit OTTI in AOCI 0 0
CMBS    
Fixed maturities    
Amortized Cost 1,142,204 776,715
Gross Unrealized Gains 1,086 4,138
Gross Unrealized Losses (21,323) (3,125)
Fair Value 1,121,967 777,728
Non-credit OTTI in AOCI 0 0
Non-Agency RMBS    
Fixed maturities    
Amortized Cost 38,572 45,713
Gross Unrealized Gains 1,574 1,917
Gross Unrealized Losses (842) (799)
Fair Value 39,304 46,831
Non-credit OTTI in AOCI (884) (853)
ABS    
Fixed maturities    
Amortized Cost 1,617,950 1,432,884
Gross Unrealized Gains 2,509 5,391
Gross Unrealized Losses (6,425) (1,994)
Fair Value 1,614,034 1,436,281
Non-credit OTTI in AOCI 0 0
Municipals    
Fixed maturities    
Amortized Cost 140,345 149,167
Gross Unrealized Gains 706 1,185
Gross Unrealized Losses (2,335) (972)
Fair Value 138,716 149,380
Non-credit OTTI in AOCI $ 0 $ 0