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INVESTMENTS (DETAILS) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 11,812,782 $ 11,897,639
Gross Unrealized Gains (fixed maturities) 148,545 52,518
Gross Unrealized Losses (fixed maturities) (123,259) (230,408)
Fair Value (fixed maturities) 11,838,068 11,719,749
Non-credit OTTI in AOCI (862) (875)
Cost 605,291 575,776
Gross Unrealized Gains (equities) 35,794 31,211
Gross Unrealized Losses (equities) (3,760) (8,989)
Fair Value (equities) 637,325 597,998
US Government and Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,552,689 1,673,617
Gross Unrealized Gains (fixed maturities) 20,614 1,545
Gross Unrealized Losses (fixed maturities) (3,123) (23,213)
Fair Value (fixed maturities) 1,570,180 1,651,949
Non-credit OTTI in AOCI 0 0
Non-US Government [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 753,923 809,025
Gross Unrealized Gains (fixed maturities) 6,718 2,312
Gross Unrealized Losses (fixed maturities) (39,918) (72,332)
Fair Value (fixed maturities) 720,723 739,005
Non-credit OTTI in AOCI 0 0
Corporate Debt [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 4,423,369 4,442,315
Gross Unrealized Gains (fixed maturities) 55,031 16,740
Gross Unrealized Losses (fixed maturities) (53,358) (96,286)
Fair Value (fixed maturities) 4,425,042 4,362,769
Non-credit OTTI in AOCI 0 0
Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 2,377,262 2,236,138
Gross Unrealized Gains (fixed maturities) 45,420 22,773
Gross Unrealized Losses (fixed maturities) (1,381) (9,675)
Fair Value (fixed maturities) 2,421,301 2,249,236
Non-credit OTTI in AOCI 0 0
CMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,099,346 1,088,595
Gross Unrealized Gains (fixed maturities) 13,221 3,885
Gross Unrealized Losses (fixed maturities) (5,883) (9,182)
Fair Value (fixed maturities) 1,106,684 1,083,298
Non-credit OTTI in AOCI 0 0
Non-Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 94,704 99,989
Gross Unrealized Gains (fixed maturities) 1,584 1,992
Gross Unrealized Losses (fixed maturities) (1,266) (973)
Fair Value (fixed maturities) 95,022 101,008
Non-credit OTTI in AOCI (862) (875)
ABS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,359,752 1,387,919
Gross Unrealized Gains (fixed maturities) 1,199 952
Gross Unrealized Losses (fixed maturities) (17,801) (17,601)
Fair Value (fixed maturities) 1,343,150 1,371,270
Non-credit OTTI in AOCI 0 0
Municipals [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 151,737 160,041
Gross Unrealized Gains (fixed maturities) 4,758 2,319
Gross Unrealized Losses (fixed maturities) (529) (1,146)
Fair Value (fixed maturities) 155,966 161,214
Non-credit OTTI in AOCI 0 0
Common Stock [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost 292 0
Gross Unrealized Gains (equities) 96 0
Gross Unrealized Losses (equities) (210) 0
Fair Value (equities) 178 0
Exchange-Traded Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost 471,879 447,524
Gross Unrealized Gains (equities) 32,339 31,211
Gross Unrealized Losses (equities) (3,550) (4,762)
Fair Value (equities) 500,668 473,973
Bond Mutual Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost 133,120 128,252
Gross Unrealized Gains (equities) 3,359 0
Gross Unrealized Losses (equities) 0 (4,227)
Fair Value (equities) $ 136,479 $ 124,025