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Investments, Investments Temporarily Impaired (Details) $ in Thousands | Sep. 30, 2018 USD ($) Investment
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Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 626
Estimated fair value, less than 12 months of temporary impairment | $ 1,211,143
Unrealized losses, less than 12 months of temporary impairment | (2,116)
Estimated fair value, more than 12 months of temporary impairment | 162,315
Unrealized losses, more than 12 months of temporary impairment | (1,826)
Estimated fair value, total temporary impairment | 1,373,458
Unrealized losses, total temporary impairment | $ (3,942)
Corporate Debt Securities [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 495
Estimated fair value, less than 12 months of temporary impairment | $ 889,172
Unrealized losses, less than 12 months of temporary impairment | (1,687)
Estimated fair value, more than 12 months of temporary impairment | 83,706
Unrealized losses, more than 12 months of temporary impairment | (997)
Estimated fair value, total temporary impairment | 972,878
Unrealized losses, total temporary impairment | $ (2,684)
Debt Securities issued by U.S. Government Agencies [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 51
Estimated fair value, less than 12 months of temporary impairment | $ 132,231
Unrealized losses, less than 12 months of temporary impairment | (139)
Estimated fair value, more than 12 months of temporary impairment | 26,862
Unrealized losses, more than 12 months of temporary impairment | (139)
Estimated fair value, total temporary impairment | 159,093
Unrealized losses, total temporary impairment | $ (278)
Debt Securities issued by the U.S. Treasury [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 32
Estimated fair value, less than 12 months of temporary impairment | $ 164,053
Unrealized losses, less than 12 months of temporary impairment | (99)
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 | 164,053
Unrealized losses, total temporary impairment | $ (99)
Debt Securities issued by States of the U.S. and Political Subdivisions of the States [Member] |
Temporarily Impaired Investments [Abstract] |
Number of investments | Investment | 48
Estimated fair value, less than 12 months of temporary impairment | $ 25,687
Unrealized losses, less than 12 months of temporary impairment | (191)
Estimated fair value, more than 12 months of temporary impairment | 51,747
Unrealized losses, more than 12 months of temporary impairment | (690)
Estimated fair value, total temporary impairment | 77,434
Unrealized losses, total temporary impairment | $ (881)

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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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