v2.3.0.15

Investments (Schedule Of Contractual Maturities Of Fixed Maturity Investments) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investments
Trading, Amortized Cost, Due in less than one year	$ 167,947
Trading, Amortized Cost, Due after one through five years	1,876,919
Trading, Amortized Cost, Due after five through ten years	815,283
Trading, Amortized Cost, Due after ten years	127,583
Trading, Amortized Cost, Mortgage backed	669,592
Trading, Amortized Cost, Asset backed	14,404
Trading, Amortized Cost	3,671,728	3,859,442
Trading, Fair Value, Due in less than one year	168,432
Trading, Fair Value, Due after one through five years	1,880,559
Trading, Fair Value, Due after five through ten years	817,714
Trading, Fair Value, Due after ten years	131,180
Trading, Fair Value, Mortgage backed	675,399
Trading, Fair Value, Asset backed	14,385
Trading, Fair Value	3,687,669	3,871,780
Available for Sale, Amortized Cost, Due in less than one year	174
Available for Sale, Amortized Cost, Due after one through five years	11,869
Available for Sale, Amortized Cost, Due after five through ten years	13,172
Available for Sale, Amortized Cost, Due after ten years	6,090
Available for Sale, Amortized Cost, Mortgage-backed	102,985
Available for Sale, Amortized Cost, Asset-backed	4,993
Available for Sale, Amortized Cost	139,283	225,549
Available for Sale, Fair Value, Due in less than one year	125
Available for Sale, Fair Value, Due after one through five years	12,857
Available for Sale, Fair Value, Due after five through ten years	13,482
Available for Sale, Fair Value, Due after ten years	6,520
Available for Sale, Fair Value, Mortgage-backed	111,761
Available for Sale, Fair Value, Asset-backed	5,224
Available for Sale, Fair Value	149,969	244,917
Debt Securities, Amortized Cost, Due in less than one year	168,121
Debt Securities, Amortized Cost, Due after one through five years	1,888,788
Debt Securities, Amortized Cost, Due after five through ten years	828,455
Debt Securities, Amortized Cost, Due after ten years	133,673
Debt Securities, Amortized Cost, Mortgage backed	772,577
Debt Securities, Amortized Cost, Asset backed	19,397
Debt Securities, Amortized Cost	3,811,011
Debt Securities, Fair Value, Due in less than one year	168,557
Debt Securities, Fair Value, Due after one through five years	1,893,416
Debt Securities, Fair Value, Due after five through ten years	831,196
Debt Securities, Fair Value, Due after ten years	137,700
Debt Securities, Fair Value, Mortgage backed	787,160
Debt Securities, Fair Value, Asset backed	19,609
Debt Securities, Fair Value	$ 3,837,638

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