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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Mar. 31, 2019 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 353
Estimated fair value, less than 12 months of temporary impairment | $ 727,648
Unrealized losses, less than 12 months of temporary impairment | (430)
Estimated fair value, more than 12 months of temporary impairment | 170,928
Unrealized losses, more than 12 months of temporary impairment | (926)
Estimated fair value, total temporary impairment | 898,576
Unrealized losses, total temporary impairment | $ (1,356)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 275
Estimated fair value, less than 12 months of temporary impairment | $ 530,786
Unrealized losses, less than 12 months of temporary impairment | (306)
Estimated fair value, more than 12 months of temporary impairment | 102,815
Unrealized losses, more than 12 months of temporary impairment | (561)
Estimated fair value, total temporary impairment | 633,601
Unrealized losses, total temporary impairment | $ (867)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 24
Estimated fair value, less than 12 months of temporary impairment | $ 91,005
Unrealized losses, less than 12 months of temporary impairment | (81)
Estimated fair value, more than 12 months of temporary impairment | 16,534
Unrealized losses, more than 12 months of temporary impairment | (46)
Estimated fair value, total temporary impairment | 107,539
Unrealized losses, total temporary impairment | $ (127)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 15
Estimated fair value, less than 12 months of temporary impairment | $ 94,603
Unrealized losses, less than 12 months of temporary impairment | (34)
Estimated fair value, more than 12 months of temporary impairment | 0
Unrealized losses, more than 12 months of temporary impairment | 0
Estimated fair value, total temporary impairment | 94,603
Unrealized losses, total temporary impairment | $ (34)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 39
Estimated fair value, less than 12 months of temporary impairment | $ 11,254
Unrealized losses, less than 12 months of temporary impairment | (9)
Estimated fair value, more than 12 months of temporary impairment | 51,579
Unrealized losses, more than 12 months of temporary impairment | (319)
Estimated fair value, total temporary impairment | 62,833
Unrealized losses, total temporary impairment | $ (328)

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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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