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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
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

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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.

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Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
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