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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Trading Securities [Abstract]
Fixed maturity investments trading, Due in less than one year, Amortized cost	$ 253,700
Fixed maturity investments trading, Due after one through five years, Amortized cost	3,872,756
Fixed maturity investments trading, Due after five through ten years, Amortized cost	1,031,351
Fixed maturity investments trading, Due after ten years, Amortized cost	220,768
Fixed maturity investments trading, Amortized cost	6,825,877	$ 4,749,613
Fixed maturity investments trading, Due in less than one year, Fair value	252,257
Fixed maturity investments trading, Due after one through five years, Fair value	3,833,261
Fixed maturity investments trading, Due after five through ten years, Fair value	1,011,132
Fixed maturity investments trading, Due after ten years, Fair value	218,850
Fixed maturity investments trading, Fair value	6,765,005
Available-for-sale Securities [Abstract]
Fixed maturity investments available-for-sale, Due in less than one year, Amortized Cost	0
Fixed maturity investments available-for-sale, Due after one through five years, Amortized cost	0
Fixed maturity investments available-for-sale, Due after five through ten years, Amortized cost	0
Fixed maturity investments available-for-sale, Due after ten years, Amortized cost	0
Fixed maturity investments available-for-sale, Amortized cost	15,943	23,772
Fixed maturity investments available-for-sale, Due in less than one year, Fair value	0
Fixed maturity investments available-for-sale, Due after one through five years, Fair value	0
Fixed maturity investments available-for-sale, Due after five through ten years, Fair value	0
Fixed maturity investments available-for-sale, Due after ten years, Fair value	0
Fixed maturity investments available-for-sale, Fair value	17,813	$ 26,885
Fixed Maturity Investments [Abstract]
Fixed maturity investments, Due in less than one year, Amortized cost	253,700
Fixed maturity investments, Due after one through five years, Amortized cost	3,872,756
Fixed maturity investments, Due after five through ten years, Amortized cost	1,031,351
Fixed maturity investments, Due after ten years, Amortized cost	220,768
Fixed maturity investments, Amortized cost	6,841,820
Fixed maturity investments, Due in less than one year, Fair value	252,257
Fixed maturity investments, Due after one through give years, Fair value	3,833,261
Fixed maturity investments, Due after five through ten years, Fair value	1,011,132
Fixed maturity investments, Due after ten years, Fair value	218,850
Fixed maturity investments, Fair value	6,782,818
Mortgage-backed
Trading Securities [Abstract]
Fixed maturity investments trading, Amortized cost	1,318,468
Fixed maturity investments trading, Fair value	1,321,228
Available-for-sale Securities [Abstract]
Fixed maturity investments available-for-sale, Amortized cost	13,726
Fixed maturity investments available-for-sale, Fair value	15,549
Fixed Maturity Investments [Abstract]
Fixed maturity investments, Amortized cost	1,332,194
Fixed maturity investments, Fair value	1,336,777
Asset-backed
Trading Securities [Abstract]
Fixed maturity investments trading, Amortized cost	128,834
Fixed maturity investments trading, Fair value	128,277
Available-for-sale Securities [Abstract]
Fixed maturity investments available-for-sale, Amortized cost	2,217
Fixed maturity investments available-for-sale, Fair value	2,264
Fixed Maturity Investments [Abstract]
Fixed maturity investments, Amortized cost	131,051
Fixed maturity investments, Fair value	$ 130,541

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- Definition

Amortized cost of investments in debt securities classified as trading.

+ References

No definition available.

+ Details

Name:	us-gaap_TradingSecuritiesDebtAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtSecurityAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtSecurityAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: