Investments (Summary Of Gross Unrealized Gains And Losses And Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 163,340	$ 114,179
Available-for-sale Securities, Gross Unrealized Gains	5,819	9,716
Available-for-sale Securities, Gross Unrealized Losses	(326)	(158)
Available-for-sale Securities	168,833	123,737
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	20,610	20,610
Available-for-sale Securities, Gross Unrealized Gains	5,631	9,558
Available-for-sale Securities, Gross Unrealized Losses	(232)	(121)
Available-for-sale Securities	26,009	30,047
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	142,730	93,569
Available-for-sale Securities, Gross Unrealized Gains	188	158
Available-for-sale Securities, Gross Unrealized Losses	(94)	(37)
Available-for-sale Securities	$ 142,824	$ 93,690