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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due in less than one year | $ 511,932 |
Due after one through five years | 4,799,196 |
Due after five through ten years | 1,086,697 |
Due after ten years | 79,084 |
Fixed maturity investments trading | 8,163,962 | $ 7,434,870
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Due in less than one year | 507,728 |
Due after one through five years | 4,762,712 |
Due after five through ten years | 1,056,087 |
Due after ten years | 76,746 |
Fixed maturity investments trading | 8,088,870 | 7,426,555
Mortgage-backed |  |
Amortized Cost |  |
Fixed maturity investments trading | 1,376,565 |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Fixed maturity investments trading | 1,378,854 |
Asset-backed |  |
Amortized Cost |  |
Fixed maturity investments trading | 310,488 |
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract] |  |
Fixed maturity investments trading | $ 306,743 | $ 182,725

X
- 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. + Details
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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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- Definition 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 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 + Details
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