Investments (Maturity Distribution) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Amortized Cost
Due in one year or less	$ 43,088
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Amortized Cost Basis	142,943
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Amortized Cost Basis	230,995
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Amortized Cost Basis	776,185
Debt Securities, Available-for-sale, Amortized Cost	1,193,211	$ 935,977
Debt Securities, Available-for-sale, Fair Value
Due in one year or less	43,190
Available-for-sale Securities, Debt Maturities, Due After One Year Through Five Years, Fair Value	146,280
Available-for-sale Securities, Debt Maturities, Due After Five Years Through Ten Years, Fair Value	232,627
Available-for-sale Securities, Debt Maturities, Due After Ten Years, Fair Value	778,057
Total Fixed Maturity Securities, Fair Value	$ 1,200,154	$ 1,215,986

Total Fixed Maturity Securities, including available for sale and held to maturity, Fair Value

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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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