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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in less than one year	$ 618,766
Due after one through five years	5,104,023
Due after five through ten years	1,841,585
Due after ten years	450,065
Amortized Cost	10,324,318	$ 8,163,962
Fair Value
Due in less than one year	616,578
Due after one through five years	5,176,183
Due after five through ten years	1,896,176
Due after ten years	456,835
Fair Value	10,479,666	8,088,870
Mortgage-backed
Amortized Cost
Amortized Cost	1,785,109
Fair Value
Fair Value	1,809,282
Asset-backed
Amortized Cost
Amortized Cost	524,770
Fair Value
Fair Value	$ 524,612	$ 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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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.

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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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