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Investments - Schedule of Securities in Unrealized Loss Position (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Securities | Dec. 31, 2015 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 67,418 | $ 549,243
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (608) | (19,294)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 81,174 | 49,328
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (3,190) | (8,139)
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 | 65,666 | 545,591
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | (485) | (19,007)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | 77,674 | 46,119
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | (2,739) | (8,044)
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 | 1,729 | 13,651
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (1) | $ (22)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 1 | 7
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 | $ 3,398 | $ 23,572
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (19) | $ (829)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 2 | 20
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 3,134 | $ 2,396
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (87) | $ (693)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 3 | 3
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 | $ 2,844 | $ 2,729
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (34) | $ (44)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 4 | 6
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value |  | $ 878
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses |  | $ (497)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities |  | 2
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 | $ 31,616 | $ 413,131
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (321) | $ (17,481)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 29 | 393
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 58,781 | $ 34,624
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (2,519) | $ (6,730)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 65 | 54
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 | $ 2,451 | $ 9,681
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (39) | $ (61)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 5 | 9
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 4,515 | $ 4,762
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (68) | $ (60)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 8 | 7
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 | $ 11,755 | $ 26,611
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (53) | $ (77)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 14 | 23
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 4,108 | $ 260
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (32) | $ (2)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 7 | 2
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 | $ 11,873 | $ 56,216
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (18) | $ (493)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 11 | 49
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 7,136 | $ 3,199
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (33) | $ (62)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 10 | 6
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 | $ 1,752 | $ 3,652
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses | $ (123) | $ (287)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, less than one year | Securities | 11 | 17
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value | $ 3,500 | $ 3,209
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses | $ (451) | $ (95)
Available-for-sale, securities in unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | Securities | 9 | 8

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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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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