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Summary of Investments - SOI Fixed Maturity AFS and non-credit OTTI in AOCI (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities available-for-sale    
Amortized cost $ 22,821,271 $ 22,762,962
Fixed maturities available-for-sale: 23,183,757 23,593,139
Fixed maturities    
Securities available-for-sale    
Amortized cost 22,821,271 22,762,962
Gross unrealized gains 690,274 973,941
Gross unrealized losses 327,788 143,764
Fixed maturities available-for-sale: 23,183,757 23,593,139
OTTI (gain) loss included in AOCI (33,151) (57,893)
U.S. government direct obligations and U.S. agencies    
Securities available-for-sale    
Amortized cost 1,392,346 1,837,748
Gross unrealized gains 32,603 41,777
Gross unrealized losses 25,591 7,883
Fixed maturities available-for-sale: 1,399,358 1,871,642
OTTI (gain) loss included in AOCI 0 0
Obligations of U.S. states and their subdivisions    
Securities available-for-sale    
Amortized cost 1,877,627 1,872,120
Gross unrealized gains 186,166 220,507
Gross unrealized losses 3,226 1,655
Fixed maturities available-for-sale: 2,060,567 2,090,972
OTTI (gain) loss included in AOCI 0 0
Corporate debt securities    
Securities available-for-sale    
Amortized cost 15,555,511 15,234,473
Gross unrealized gains 380,876 581,991
Gross unrealized losses 246,981 110,377
Fixed maturities available-for-sale: 15,689,406 15,706,087
OTTI (gain) loss included in AOCI (887) (1,018)
Perpetual debt investments    
Securities available-for-sale    
Amortized cost 89,267 89,267
Fixed maturities available-for-sale: 88,877 87,348
Asset-backed securities    
Securities available-for-sale    
Amortized cost 1,592,351 1,622,806
Gross unrealized gains 76,838 105,301
Gross unrealized losses 18,172 10,131
Fixed maturities available-for-sale: 1,651,017 1,717,976
OTTI (gain) loss included in AOCI (32,154) (56,735)
Residential mortgage-backed securities    
Securities available-for-sale    
Amortized cost 137,413 63,187
Gross unrealized gains 2,278 2,446
Gross unrealized losses 1,109 649
Fixed maturities available-for-sale: 138,582 64,984
OTTI (gain) loss included in AOCI (110) (140)
Commercial mortgage-backed securities    
Securities available-for-sale    
Amortized cost 1,374,477 1,352,906
Gross unrealized gains 6,728 17,692
Gross unrealized losses 32,708 12,989
Fixed maturities available-for-sale: 1,348,497 1,357,609
OTTI (gain) loss included in AOCI 0 0
Collateralized debt obligations    
Securities available-for-sale    
Amortized cost 891,546 779,722
Gross unrealized gains 4,785 4,227
Gross unrealized losses 1 80
Fixed maturities available-for-sale: 896,330 783,869
OTTI (gain) loss included in AOCI $ 0 $ 0