Investments (Net Realized Gains (Losses) on Invesments, Excluding Other Than Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses	$ 1,579	$ 5,256	$ 7,790	$ 10,680
Fixed Maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross realized gains	1,520	4,956	11,571	11,047
Gross realized losses	(1)	(79)	(4,463)	(2,678)
Gross realized gains (losses), excluding other than temporary impairments	1,519	4,877	7,108	8,369
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross realized gains	348	0	348	0
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Gain on sale of real estate	12	31	56	867
Loss on sale of real estate	0	0	0	(93)
Gain (loss) on other investments	12	31	56	774
Mortgage Loans on Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Decrease (increase) in allowance for credit losses	(300)	(113)	278	(3,946)
Recovery of specific allowance	0	461	0	5,483
Change in allowance for credit losses and recoveries	$ (300)	$ 348	$ 278	$ 1,537

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

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Gain (loss) recognized during the period on the assets in our investment porfolio categorized as other investments.

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

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

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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
-Subparagraph (a)
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26805-111562

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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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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