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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost, Due in less than one year | $ 119,010 |
Trading Debt Securities, Amortized Cost, Due after one through five years | 2,951,583 |
Trading Debt Securities, Amortized Cost, Due after five through ten years | 499,093 |
Trading Debt Securities, Amortized Cost, Due after ten years | 81,215 |
Trading Debt Securities, Amortized Cost | 4,532,381 |
Trading Debt Securities, Fair Value, Due in less than one year | 119,599 |
Trading Debt Securities, Fair Value, Due after one through five years | 2,963,494 |
Trading Debt Securities, Fair Value, Due after five through ten years | 504,919 |
Trading Debt Securities, Fair Value, Due after ten years | 100,732 |
Trading Debt Securities, Fair Value | 4,587,412 |
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 | 0 |
Available for Sale, Amortized Cost, Due after five through ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for Sale, Amortized Cost | 26,402 | 30,273
Available for Sale, Fair Value, Due in less than one year | 0 |
Available for Sale, Fair Value, Due after one through five years | 0 |
Available for Sale, Fair Value, Due after five through ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 0 |
Available for Sale, Fair Value | 30,205 | 34,241
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost, Due in less than one year | 119,010 |
Debt Securities, Amortized Cost, Due after one through five years | 2,951,583 |
Debt Securities, Amortized Cost, Due after five through ten years | 499,093 |
Debt Securities, Amortized Cost, Due after ten years | 81,215 |
Debt Securities, Amortized Cost | 4,558,783 |
Debt Securities, Fair Value, Due in less than one year | 119,599 |
Debt Securities, Fair Value, Due after one through give years | 2,963,494 |
Debt Securities, Fair Value, Due after five through ten years | 504,919 |
Debt Securities, Fair Value, Due after ten years | 100,732 |
Debt Securities, Fair Value | 4,617,617 |
Mortgage-backed |  |
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost | 866,984 |
Trading Debt Securities, Fair Value | 883,896 |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost | 22,912 |
Available for Sale, Fair Value | 26,514 |
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost | 889,896 |
Debt Securities, Fair Value | 910,410 |
Asset-backed |  |
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost | 14,496 |
Trading Debt Securities, Fair Value | 14,772 |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost | 3,490 |
Available for Sale, Fair Value | 3,691 |
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost | 17,986 |
Debt Securities, Fair Value | $ 18,463 |

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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