Investments (Schedule Of Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Investment Income [Line Items]
Net investment income	$ 36,793	$ 37,635	$ 84,412	$ 71,023
Fixed maturity investments [Member]
Net Investment Income [Line Items]
Net investment income	35,936	32,662	72,235	65,187
Equity securities [Member]
Net Investment Income [Line Items]
Net investment income	5,912	4,409	9,165	7,608
Other invested assets [Member]
Net Investment Income [Line Items]
Net investment income	(890)	3,843	10,518	5,307
Cash and cash equivalents [Member]
Net Investment Income [Line Items]
Net investment income	571	529	1,010	1,017
Expenses [Member]
Net Investment Income [Line Items]
Net investment income	$ (4,736)	$ (3,808)	$ (8,516)	$ (8,096)