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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in less than one year	$ 605,595
Due after one through five years	5,820,074
Due after five through ten years	2,170,132
Due after ten years	179,147
Amortized Cost	11,214,394	$ 8,163,962
Fair Value
Due in less than one year	603,806
Due after one through five years	5,893,946
Due after five through ten years	2,232,264
Due after ten years	189,068
Fair Value	11,386,228	8,088,870
Mortgage-backed
Amortized Cost
Amortized Cost	1,888,719
Fair Value
Fair Value	1,916,840
Asset-backed
Amortized Cost
Amortized Cost	550,727
Fair Value
Fair Value	$ 550,304	$ 306,743

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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 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 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.

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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).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amortized cost of investments in debt securities classified as trading.

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