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INVESTMENTS (DETAILS) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 11,897,639 $ 12,185,973
Gross Unrealized Gains (fixed maturities) 52,518 116,538
Gross Unrealized Losses (fixed maturities) (230,408) (173,238)
Fair Value (fixed maturities) 11,719,749 12,129,273
Non-credit OTTI in AOCI (875) (889)
Cost 575,776 531,648
Gross Unrealized Gains (equities) 31,211 43,583
Gross Unrealized Losses (equities) (8,989) (7,524)
Fair Value (equities) 597,998 567,707
US Government and Agency [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,673,617 1,645,068
Gross Unrealized Gains (fixed maturities) 1,545 3,337
Gross Unrealized Losses (fixed maturities) (23,213) (28,328)
Fair Value (fixed maturities) 1,651,949 1,620,077
Non-credit OTTI in AOCI 0 0
Non-US Government [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 809,025 1,080,601
Gross Unrealized Gains (fixed maturities) 2,312 7,383
Gross Unrealized Losses (fixed maturities) (72,332) (54,441)
Fair Value (fixed maturities) 739,005 1,033,543
Non-credit OTTI in AOCI 0 0
Corporate Debt [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 4,442,315 4,386,432
Gross Unrealized Gains (fixed maturities) 16,740 40,972
Gross Unrealized Losses (fixed maturities) (96,286) (66,280)
Fair Value (fixed maturities) 4,362,769 4,361,124
Non-credit OTTI in AOCI 0 0
Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 2,236,138 2,241,581
Gross Unrealized Gains (fixed maturities) 22,773 40,762
Gross Unrealized Losses (fixed maturities) (9,675) (4,235)
Fair Value (fixed maturities) 2,249,236 2,278,108
Non-credit OTTI in AOCI 0 0
CMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,088,595 1,085,618
Gross Unrealized Gains (fixed maturities) 3,885 13,289
Gross Unrealized Losses (fixed maturities) (9,182) (2,019)
Fair Value (fixed maturities) 1,083,298 1,096,888
Non-credit OTTI in AOCI 0 0
Non-Agency RMBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 99,989 71,236
Gross Unrealized Gains (fixed maturities) 1,992 2,765
Gross Unrealized Losses (fixed maturities) (973) (915)
Fair Value (fixed maturities) 101,008 73,086
Non-credit OTTI in AOCI (875) (889)
ABS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,387,919 1,475,026
Gross Unrealized Gains (fixed maturities) 952 2,748
Gross Unrealized Losses (fixed maturities) (17,601) (16,188)
Fair Value (fixed maturities) 1,371,270 1,461,586
Non-credit OTTI in AOCI 0 0
Municipals [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 160,041 200,411
Gross Unrealized Gains (fixed maturities) 2,319 5,282
Gross Unrealized Losses (fixed maturities) (1,146) (832)
Fair Value (fixed maturities) 161,214 204,861
Non-credit OTTI in AOCI 0 0
Exchange-Traded Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost 447,524 416,063
Gross Unrealized Gains (equities) 31,211 43,583
Gross Unrealized Losses (equities) (4,762) (4,756)
Fair Value (equities) 473,973 454,890
Bond Mutual Funds [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Cost 128,252 115,585
Gross Unrealized Gains (equities) 0 0
Gross Unrealized Losses (equities) (4,227) (2,768)
Fair Value (equities) $ 124,025 $ 112,817