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Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses	$ (563)	$ 302
Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains	1,171	1,382
Gross realized losses	(1,794)	(2,102)
Gross realized gains (losses), excluding other than temporary impairment	(623)	(720)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Decrease in allowance for credit losses	60	300
Recovery of specific allowance	0	722
Change in allowance for credit losses and recoveries	$ 60	$ 1,022

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Financing Receivable, Allowance For Credit Losses, Period (Increase) Decrease, Provision And Recoveries, Total

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Amount of realized gain on 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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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), excluding other-than-temporary impairment (OTTI).

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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