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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gain (Loss) on Investments [Line Items]
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses	$ 844	$ 5,256	$ 2,737	$ 2,687	$ (151)	$ 1,159	$ 4,324	$ 4,879	$ 11,524	$ 10,211	$ (4,003)
Fixed Maturity Securities [Member]
Gain (Loss) on Investments [Line Items]
Available for sale fixed maturity securities: gross realized gains									14,132	7,230	3,273
Available for sale fixed maturity securities: gross realized losses									(4,036)	(5,787)	(1,006)
Available for sale fixed maturity securities: gross realized gains (losses), excluding other than temporary impairments									10,096	1,443	2,267
Other Investments [Member]
Gain (Loss) on Investments [Line Items]
Other investments: gain on sale of real estate									884	4,194	2,454
Other investments: loss on sale of real estate									(93)	(575)	(231)
Other investments: impairment losses on real estate									0	(1,297)	(2,441)
Gain (loss) on other investments									791	2,322	(218)
Mortgage Loans on Real Estate [Member]
Gain (Loss) on Investments [Line Items]
Mortgage loans on real estate: decrease (increase) in allowance for credit losses									(4,846)	1,018	(6,052)
Mortgage loans on real estate: recovery of specific allowance									5,483	5,428	0
Mortgage loans on real estate: change in allowance for provision and recoveries									$ 637	$ 6,446	$ (6,052)

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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.

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

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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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