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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Jun. 30, 2019 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 185
Estimated fair value, less than 12 months of temporary impairment | $ 476,280
Unrealized losses, less than 12 months of temporary impairment | (434)
Estimated fair value, more than 12 months of temporary impairment | 106,806
Unrealized losses, more than 12 months of temporary impairment | (278)
Estimated fair value, total temporary impairment | 583,086
Unrealized losses, total temporary impairment | $ (712)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 145
Estimated fair value, less than 12 months of temporary impairment | $ 340,153
Unrealized losses, less than 12 months of temporary impairment | (302)
Estimated fair value, more than 12 months of temporary impairment | 63,109
Unrealized losses, more than 12 months of temporary impairment | (157)
Estimated fair value, total temporary impairment | 403,262
Unrealized losses, total temporary impairment | $ (459)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 14
Estimated fair value, less than 12 months of temporary impairment | $ 89,023
Unrealized losses, less than 12 months of temporary impairment | (105)
Estimated fair value, more than 12 months of temporary impairment | 2,980
Unrealized losses, more than 12 months of temporary impairment | (18)
Estimated fair value, total temporary impairment | 92,003
Unrealized losses, total temporary impairment | $ (123)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 3
Estimated fair value, less than 12 months of temporary impairment | $ 47,104
Unrealized losses, less than 12 months of temporary impairment | (27)
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 | 47,104
Unrealized losses, total temporary impairment | $ (27)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 23
Estimated fair value, less than 12 months of temporary impairment | $ 0
Unrealized losses, less than 12 months of temporary impairment | 0
Estimated fair value, more than 12 months of temporary impairment | 40,717
Unrealized losses, more than 12 months of temporary impairment | (103)
Estimated fair value, total temporary impairment | 40,717
Unrealized losses, total temporary impairment | $ (103)

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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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