Investments (Schedule Of Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Investment Income [Line Items]
Net investment income	$ 47,619	$ 33,388
Fixed maturity investments [Member]
Net Investment Income [Line Items]
Net investment income	36,299	32,525
Equity securities [Member]
Net Investment Income [Line Items]
Net investment income	3,253	3,199
Other invested assets [Member]
Net Investment Income [Line Items]
Net investment income	11,408	1,464
Cash and cash equivalents [Member]
Net Investment Income [Line Items]
Net investment income	439	488
Expenses [Member]
Net Investment Income [Line Items]
Net investment income	$ (3,780)	$ (4,288)