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Investments - Schedule of Securities in Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2018 USD ($) Securities | Dec. 31, 2017 USD ($) Securities
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | $ 427,430
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses |  | (3,659)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value |  | 95,841
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses |  | (2,283)
Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 1,051,010 | 426,354
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (21,355) | (3,643)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 116,719 | 95,671
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (4,163) | (2,279)
U.S. Government and Agencies [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | 6,044 | 4,754
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (80) | $ (34)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 5 | 5
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 1,729 | $ 2,975
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (7) | $ (13)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 3 | 3
Foreign Government [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 43,032 | $ 40,287
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (578) | $ (465)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 40 | 45
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 25,350 | $ 7,102
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (566) | $ (183)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 31 | 7
States and Political Subdivisions [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 21,410 | $ 7,369
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (252) | $ (43)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 19 | 7
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 6,229 | $ 6,267
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (136) | $ (98)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 7 | 7
Corporates [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 730,969 | $ 247,613
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (15,574) | $ (2,323)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 588 | 216
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 51,454 | $ 39,767
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (2,688) | $ (1,332)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 60 | 43
Residential Mortgage-backed Securities [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 97,132 | $ 33,610
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (2,271) | $ (263)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 49 | 16
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 2,332 | $ 2,592
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (73) | $ (34)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 6 | 8
Commercial Mortgage-backed Securities [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 100,307 | $ 60,116
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (1,902) | $ (394)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 82 | 52
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 19,084 | $ 22,149
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (567) | $ (516)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 24 | 25
Other Asset-backed Securities [Member] | Fixed-maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 52,116 | $ 32,605
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (698) | $ (121)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 53 | 33
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 10,541 | $ 14,819
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (126) | $ (103)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 13 | 19
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value |  | $ 1,076
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses |  | $ (16)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities |  | 4
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value |  | $ 170
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses |  | $ (4)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities |  | 2

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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