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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Trading Securities
Amortized Cost, Due in less than one year	$ 303,364
Amortized Cost, Due after one through five years	4,759,113
Amortized Cost, Due after five through ten years	1,029,502
Amortized Cost, Due after ten years	96,311
Amortized Cost	7,901,884	$ 7,434,870
Fair Value, Due in less than one year	301,817
Fair Value, Due after one through five years	4,694,059
Fair Value, Due after five through ten years	1,020,157
Fair Value, Due after ten years	93,395
Fair Value	7,814,779	7,426,555
Mortgage-backed
Trading Securities
Amortized Cost	1,390,933
Fair Value	1,383,459
Asset-backed
Trading Securities
Amortized Cost	322,661
Fair Value	$ 321,892	$ 182,725

X

- Definition

This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one through 5 years of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- Definition

This item represents the fair value of debt securities which are expected to mature after five through ten years of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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X

- Definition

This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one year of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- Definition

This item represents the fair value of debt securities which are expected to mature after one through five years of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- Definition

This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature after ten years of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- Definition

This item represents the fair value of debt securities which are expected to mature after ten years of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- Definition

This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one year of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- Definition

This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

+ Details

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- References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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- Definition

Amortized cost of investments in debt securities classified as trading.

+ References

No definition available.

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