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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Dec. 31, 2018 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 681
Estimated fair value, less than 12 months of temporary impairment | $ 1,358,853
Unrealized losses, less than 12 months of temporary impairment | (2,159)
Estimated fair value, more than 12 months of temporary impairment | 225,056
Unrealized losses, more than 12 months of temporary impairment | (1,909)
Estimated fair value, total temporary impairment | 1,583,909
Unrealized losses, total temporary impairment | $ (4,068)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 546
Estimated fair value, less than 12 months of temporary impairment | $ 1,000,461
Unrealized losses, less than 12 months of temporary impairment | (1,936)
Estimated fair value, more than 12 months of temporary impairment | 126,357
Unrealized losses, more than 12 months of temporary impairment | (1,208)
Estimated fair value, total temporary impairment | 1,126,818
Unrealized losses, total temporary impairment | $ (3,144)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 50
Estimated fair value, less than 12 months of temporary impairment | $ 161,312
Unrealized losses, less than 12 months of temporary impairment | (109)
Estimated fair value, more than 12 months of temporary impairment | 34,403
Unrealized losses, more than 12 months of temporary impairment | (104)
Estimated fair value, total temporary impairment | 195,715
Unrealized losses, total temporary impairment | $ (213)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 36
Estimated fair value, less than 12 months of temporary impairment | $ 183,212
Unrealized losses, less than 12 months of temporary impairment | (100)
Estimated fair value, more than 12 months of temporary impairment | 1,413
Unrealized losses, more than 12 months of temporary impairment | (1)
Estimated fair value, total temporary impairment | 184,625
Unrealized losses, total temporary impairment | $ (101)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 49
Estimated fair value, less than 12 months of temporary impairment | $ 13,868
Unrealized losses, less than 12 months of temporary impairment | (14)
Estimated fair value, more than 12 months of temporary impairment | 62,883
Unrealized losses, more than 12 months of temporary impairment | (596)
Estimated fair value, total temporary impairment | 76,751
Unrealized losses, total temporary impairment | $ (610)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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