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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Sep. 30, 2019 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 154
Estimated fair value, less than 12 months of temporary impairment | $ 486,854
Unrealized losses, less than 12 months of temporary impairment | (480)
Estimated fair value, more than 12 months of temporary impairment | 70,246
Unrealized losses, more than 12 months of temporary impairment | (99)
Estimated fair value, total temporary impairment | 557,100
Unrealized losses, total temporary impairment | $ (579)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 104
Estimated fair value, less than 12 months of temporary impairment | $ 304,705
Unrealized losses, less than 12 months of temporary impairment | (268)
Estimated fair value, more than 12 months of temporary impairment | 31,675
Unrealized losses, more than 12 months of temporary impairment | (41)
Estimated fair value, total temporary impairment | 336,380
Unrealized losses, total temporary impairment | $ (309)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 28
Estimated fair value, less than 12 months of temporary impairment | $ 102,733
Unrealized losses, less than 12 months of temporary impairment | (156)
Estimated fair value, more than 12 months of temporary impairment | 22,974
Unrealized losses, more than 12 months of temporary impairment | (26)
Estimated fair value, total temporary impairment | 125,707
Unrealized losses, total temporary impairment | $ (182)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 9
Estimated fair value, less than 12 months of temporary impairment | $ 77,918
Unrealized losses, less than 12 months of temporary impairment | (55)
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 | 77,918
Unrealized losses, total temporary impairment | $ (55)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 13
Estimated fair value, less than 12 months of temporary impairment | $ 1,498
Unrealized losses, less than 12 months of temporary impairment | (1)
Estimated fair value, more than 12 months of temporary impairment | 15,597
Unrealized losses, more than 12 months of temporary impairment | (32)
Estimated fair value, total temporary impairment | 17,095
Unrealized losses, total temporary impairment | $ (33)

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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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