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Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Corporate Debt Securities [Member] |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 596,809
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 88,674
Foreign Government Debt [Member] |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 317,640
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | $ 0

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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