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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due in less than one year | $ 632,368 |
Due after one through five years | 5,265,502 |
Due after five through ten years | 3,674,901 |
Due after ten years | 549,661 |
Amortized cost | 13,155,035 | $ 11,067,414
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Due in less than one year | 637,418 |
Due after one through five years | 5,391,122 |
Due after five through ten years | 3,806,564 |
Due after ten years | 583,908 |
Fixed maturity investments | 13,506,503 | 11,171,655
Mortgage-backed |  |
Amortized Cost |  |
Amortized cost | 2,145,366 |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Fixed maturity investments | 2,196,507 |
Asset-backed |  |
Amortized Cost |  |
Amortized cost | 887,237 |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Fixed maturity investments | $ 890,984 | $ 555,070

X
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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. + References No definition available. + Details
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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. + Details
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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. + References No definition available. + Details
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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 within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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