Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fixed Maturity Securities [Member]
Investments [Line Items]
Gross Realized Gains	$ 3,327	$ 631	$ 7,015
Gross Realized Losses	(19,133)	(495)	(9,734)
Net	(15,806)	136	(2,719)
Equity Securities [Member]
Investments [Line Items]
Gross Realized Gains	29,446	41,305	59,342
Gross Realized Losses	(29,945)	(58,764)	(17,705)
Net	(499)	(17,459)	41,637
Short-term Investments [Member]
Investments [Line Items]
Gross Realized Gains	6	0	0
Gross Realized Losses	(529)	(1,396)	(1,943)
Net	$ (523)	$ (1,396)	$ (1,943)