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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Amortized  Cost
Due in less than one year	$ 617,235
Due after one through five years	5,622,660
Due after five through ten years	3,247,152
Due after ten years	650,611
Amortized Cost	13,070,757	$ 11,067,414
Fair Value
Due in less than one year	621,610
Due after one through five years	5,749,128
Due after five through ten years	3,374,898
Due after ten years	669,190
Fixed maturity investments	13,391,318	11,171,655
Mortgage-backed
Amortized  Cost
Amortized Cost	2,124,561
Fair Value
Fixed maturity investments	2,169,422
Asset-backed
Amortized  Cost
Amortized Cost	808,538
Fair Value
Fixed maturity investments	$ 807,070	$ 555,070

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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 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.

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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 after one through five years of the balance sheet date and are categorized as trading securities.

+ References

No definition available.

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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.

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No definition available.

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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.

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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)
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Amortized cost of investments in debt securities classified as trading.

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