Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses	$ (3,832)	$ (38,381)	$ (4,395)	$ (38,079)
Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains	5,255	958	6,426	2,340
Gross realized losses	(2,287)	(39,633)	(4,081)	(41,735)
Gross realized gains (losses), excluding other than temporary impairment	2,968	(38,675)	2,345	(39,395)
Other Investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	7,296	0	7,296	0
Gross realized losses	(14,446)	0	(14,446)	0
Gross realized gains (losses), excluding other than temporary impairment	(7,150)	0	(7,150)	0
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Decrease in allowance for credit losses	350	170	410	470
Recovery of specific allowance	0	0	0	722
Gain on sale of mortgage loans	0	124	0	124
Change in allowance for credit losses and recoveries	$ 350	$ 294	$ 410	$ 1,316

Amount of gain on sale or disposal of an equity method investment.

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Amount of loss on sale or disposal or an equity method investment.

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

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Net realized gain (loss) on investments, excluding other than temporary impairment losses

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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 realized 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 gain (loss) on sale or disposal of an equity method investment.

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

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Reflects the net positive or negative amount derived from subtracting from net proceeds of sale and the carrying amounts, net of allocated reserves, of financial assets transferred to third parties in transactions that qualify for sales treatment.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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