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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in less than one year	$ 746,898
Due after one through five years	5,287,434
Due after five through ten years	1,147,028
Due after ten years	281,009
Amortized Cost	9,442,370	$ 8,163,962
Fair Value
Due in less than one year	744,030
Due after one through five years	5,301,425
Due after five through ten years	1,154,682
Due after ten years	281,193
Fair Value	9,473,160	8,088,870
Mortgage-backed
Amortized Cost
Amortized Cost	1,460,090
Fair Value
Fair Value	1,473,819
Asset-backed
Amortized Cost
Amortized Cost	519,911
Fair Value
Fair Value	$ 518,011	$ 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

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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
-Topic 320
-SubTopic 10
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Amortized cost of investments in debt securities classified as trading.

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