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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Mar. 31, 2020 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 320
Estimated fair value, less than 12 months of temporary impairment | $ 817,109
Unrealized losses, less than 12 months of temporary impairment | (4,829)
Estimated fair value, more than 12 months of temporary impairment | 34,053
Unrealized losses, more than 12 months of temporary impairment | (11)
Estimated fair value, total temporary impairment | 851,162
Unrealized losses, total temporary impairment | $ (4,840)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 305
Estimated fair value, less than 12 months of temporary impairment | $ 750,404
Unrealized losses, less than 12 months of temporary impairment | (4,793)
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 | 750,404
Unrealized losses, total temporary impairment | $ (4,793)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 11
Estimated fair value, less than 12 months of temporary impairment | $ 47,473
Unrealized losses, less than 12 months of temporary impairment | (32)
Estimated fair value, more than 12 months of temporary impairment | 34,053
Unrealized losses, more than 12 months of temporary impairment | (11)
Estimated fair value, total temporary impairment | 81,526
Unrealized losses, total temporary impairment | $ (43)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 1
Estimated fair value, less than 12 months of temporary impairment | $ 15,598
Unrealized losses, less than 12 months of temporary impairment | (2)
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 | 15,598
Unrealized losses, total temporary impairment | $ (2)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 3
Estimated fair value, less than 12 months of temporary impairment | $ 3,634
Unrealized losses, less than 12 months of temporary impairment | (2)
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 | 3,634
Unrealized losses, total temporary impairment | $ (2)

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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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