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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized  Cost
Due in less than one year	$ 361,912
Due after one through five years	6,135,329
Due after five through ten years	4,041,811
Due after ten years	318,245
Amortized Cost	13,303,855	$ 13,155,035
Fair Value
Due in less than one year	365,154
Due after one through five years	6,191,724
Due after five through ten years	4,060,205
Due after ten years	328,582
Fixed maturity investments	13,418,389	13,506,503
Mortgage-backed
Amortized  Cost
Amortized Cost	1,528,338
Fair Value
Fixed maturity investments	1,552,451
Asset-backed
Amortized  Cost
Amortized Cost	918,220
Fair Value
Fixed maturity investments	$ 920,273	$ 890,984

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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.

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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.

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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.

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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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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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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.

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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.

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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
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Amortized cost of investments in debt securities classified as trading.

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