Investments Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Investment Income [Line Items]
Total investment income	$ 56,482	$ 54,762	$ 50,183
Investment expense	(2,277)	(1,616)	(1,623)
Net investment income	54,205	53,146	48,560
Debt Securities [Member]
Net Investment Income [Line Items]
Investment income	49,126	48,164	43,637
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income	722	708	851
Mortgage Loans on Real Estate [Member]
Net Investment Income [Line Items]
Investment income	12	11	24
Policy Loans [Member]
Net Investment Income [Line Items]
Investment income	6,210	5,735	5,277
Other Long-term Investments [Member]
Net Investment Income [Line Items]
Investment income	3	76	305
Other Debt Obligations [Member]
Net Investment Income [Line Items]
Investment income	$ 409	$ 68	$ 89

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, 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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