v2.4.0.6

Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Trading Securities [Abstract]
Amortized Cost, Due in less than one year	$ 216,198
Amortized Cost, Due after one through five years	2,613,378
Amortized Cost, Due after five through ten years	549,292
Amortized Cost, Due after ten years	129,104
Trading Debt Securities, Amortized Cost Basis	4,430,285
Trading Securities, Debt Maturities, within One Year, Fair Value	215,538
Trading Securities, Debt Maturities, after One Through Five Years, Fair Value	2,636,410
Trading Securities, Debt Maturities, after Five Through Ten Years, Fair Value	568,695
Trading Securities, Debt Maturities, after Ten Years, Fair Value	141,455
Trading Securities	4,511,885
Available-for-sale Securities [Abstract]
Available for Sale, Amortized Cost, Due in less than one year	0
Available for Sale, Amortized Cost, Due after one through five years	2,312
Available for Sale, Amortized Cost, Due after five through ten years	1,155
Available for Sale, Amortized Cost, Due after ten years	786
Available for Sale, Amortized Cost	39,324	71,445
Available for Sale, Fair Value, Due in less than one year	0
Available for Sale, Fair Value, Due after one through five years	2,648
Available for Sale, Fair Value, Due after five through ten years	1,234
Available for Sale, Fair Value, Due after ten years	940
Available for Sale, Fair Value	45,254	83,442
Fixed Maturity Investments [Abstract]
Debt Securities, Amortized Cost, Due in less than one year	216,198
Debt Securities, Amortized Cost, Due after one through five years	2,615,690
Debt Securities, Amortized Cost, Due after five through ten years	550,447
Debt Securities, Amortized Cost, Due after ten years	129,890
Debt Securities, Amortized Cost	4,469,609
Debt Securities, Fair Value, Due in less than one year	215,538
Debt Securities, Fair Value, Due after one through give years	2,639,058
Debt Securities, Fair Value, Due after five through ten years	569,929
Debt Securities, Fair Value, Due after ten years	142,395
Debt Securities, Fair Value	4,557,139
Mortgage-backed [Member]
Trading Securities [Abstract]
Trading Debt Securities, Amortized Cost Basis	914,832
Trading Securities	941,878
Available-for-sale Securities [Abstract]
Available for Sale, Amortized Cost	30,998
Available for Sale, Fair Value	35,978
Fixed Maturity Investments [Abstract]
Debt Securities, Amortized Cost	945,830
Debt Securities, Fair Value	977,856
Asset-backed [Member]
Trading Securities [Abstract]
Trading Debt Securities, Amortized Cost Basis	7,481
Trading Securities	7,909
Available-for-sale Securities [Abstract]
Available for Sale, Amortized Cost	4,073
Available for Sale, Fair Value	4,454
Fixed Maturity Investments [Abstract]
Debt Securities, Amortized Cost	11,554
Debt Securities, Fair Value	$ 12,363

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