Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses	$ (38,381)	$ 3,873	$ (38,079)	$ 6,211
Fixed Maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross realized gains	958	4,479	2,340	10,051
Gross realized losses	(39,633)	(899)	(41,735)	(4,462)
Gross realized gains (losses), excluding other than temporary impairments	(38,675)	3,580	(39,395)	5,589
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Gain on sale of real estate	0	15	0	44
Mortgage Loans on Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Decrease in allowance for credit losses	170	278	470	578
Recovery of specific allowance	0	0	722	0
Gain on sale of mortgage loans	124	0	124	0
Change in allowance for credit losses and recoveries	$ 294	$ 278	$ 1,316	$ 578

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

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- Definition

The gain resulting from sales and other disposals of other real estate owned.

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No definition available.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 20
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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