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Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Gains (losses) due to changes in fair value of investments	$ 17,608	$ (21,132)	$ 59,740	$ 34,527
Note Receivable [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Gains (losses) due to changes in fair value of investments	(103)	0	(103)	0
Investments [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Gains (losses) due to changes in fair value of investments	17,711	(21,132)	59,843	34,527
Fixed maturity securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Gains (losses) due to changes in fair value of investments	9,796	(19,521)	45,705	20,913
Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Gains (losses) due to changes in fair value of investments	7,765	(2,143)	14,227	13,430
Short-term investments [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Gains (losses) due to changes in fair value of investments	$ 150	$ 532	$ (89)	$ 184

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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- Definition

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.

+ References

No definition available.

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