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Investments - Fixed-maturity Securities Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands

Jun. 30, 2018

Dec. 31, 2017

^[2]

Available-for-sale Securities, Debt Maturities [Abstract]

Due in one year or less, amortized cost

$ 167,037

Due after one year through five years, amortized cost

861,401

Due after five years through 10 years, amortized cost

526,109

Due after 10 years, amortized cost

51,371

Total fixed-maturity securities with single maturity dates, amortized cost

1,605,918

Mortgage and asset-backed securities, amortized cost

378,038

Available-for-sale debt securities, amortized cost basis

1,983,956

^[1]

$ 1,877,326

Due in one year or less, fair value

168,983

Due after one year through five years, fair value

864,997

Due after five years through 10 years, fair value

520,398

Due after 10 years, fair value

54,540

Total fixed-maturity securities with single maturity dates, fair value

1,608,918

Mortgage and asset-backed securities, fair value

376,972

Available-for-sale debt securities, at fair value

$ 1,985,890

^[1]

$ 1,927,842

[1]	Includes $0.2 million of other-than-temporary impairment ("OTTI") losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).
[2]	Includes $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income (loss).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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