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Investments Cost, unrealized gains and losses and fair value - (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] $ 13,778,936 $ 14,358,761
Gross unrealized gains 380,754 731,950
Gross unrealized losses (220,879) (89,774)
Fair value 13,938,811 15,000,937
Trading securities [Member] | Fixed maturities    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 13,313,819 13,489,633
Gross unrealized gains 309,393 491,279
Gross unrealized losses (174,950) (62,167)
Fair value 13,448,262 13,918,745
Trading securities [Member] | Fixed maturities | U.S. government and government sponsored enterprises    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 2,887,000 2,308,264
Gross unrealized gains 4,253 13,350
Gross unrealized losses (18,408) (6,192)
Fair value 2,872,845 2,315,422
Trading securities [Member] | Fixed maturities | U.S. states, territories and municipalities    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 743,413 511,228
Gross unrealized gains 39,543 21,058
Gross unrealized losses (4,630) (1,683)
Fair value 778,326 530,603
Trading securities [Member] | Fixed maturities | Non-U.S. sovereign government, supranational and government related    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 1,271,416 1,866,915
Gross unrealized gains 71,399 112,029
Gross unrealized losses (9,890) (2,742)
Fair value 1,332,925 1,976,202
Trading securities [Member] | Fixed maturities | Corporate    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 5,035,006 5,363,006
Gross unrealized gains 138,678 263,349
Gross unrealized losses (87,485) (22,195)
Fair value 5,086,199 5,604,160
Trading securities [Member] | Fixed maturities | Asset-backed securities [Member]    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 1,040,144 1,110,393
Gross unrealized gains 13,341 23,131
Gross unrealized losses (15,669) (2,104)
Fair value 1,037,816 1,131,420
Trading securities [Member] | Fixed maturities | Residential mortgage-backed securities    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 2,287,173 2,276,200
Gross unrealized gains 41,154 56,875
Gross unrealized losses (37,687) (26,599)
Fair value 2,290,640 2,306,476
Trading securities [Member] | Fixed maturities | Other mortgage-backed securities    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 49,667 53,627
Gross unrealized gains 1,025 1,487
Gross unrealized losses (1,181) (652)
Fair value 49,511 54,462
Trading securities [Member] | Short-term investments    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 46,689 25,699
Gross unrealized gains 33 4
Gross unrealized losses (34) (25)
Fair value 46,688 25,678
Trading securities [Member] | Equities    
Schedule Of Trading Securities And Other Trading Assets [Line Items]    
Cost [1] 418,428 843,429
Gross unrealized gains 71,328 240,667
Gross unrealized losses (45,895) (27,582)
Fair value $ 443,861 $ 1,056,514
[1] Cost is amortized cost for fixed maturities and short-term investments and cost for equity securities.