Investments Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Investment Income [Line Items]
Total investment income	$ 61,360	$ 56,482	$ 54,762
Investment expense	(1,829)	(2,277)	(1,616)
Net investment income	59,531	54,205	53,146
Debt Securities [Member]
Net Investment Income [Line Items]
Investment income	53,860	49,126	48,164
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income	662	722	708
Policy Loans [Member]
Net Investment Income [Line Items]
Investment income	6,451	6,210	5,735
Other Long-term Investments [Member]
Net Investment Income [Line Items]
Investment income	13	15	87
Other [Member]
Net Investment Income [Line Items]
Investment income	$ 374	$ 409	$ 68

Total of all investment income before investment expenses

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Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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Amount of expenses related to the generation of investment income.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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