Investments (Summary Of Gross Unrealized Gains And Losses And Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 114,179	$ 87,151
Available-for-sale Securities, Gross Unrealized Gains	9,716	3,400
Available-for-sale Securities, Gross Unrealized Losses	(158)	(534)
Available-for-sale Securities	123,737	90,017
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	9,558	3,251
Available-for-sale Securities, Gross Unrealized Losses	(121)	(367)
Available-for-sale Securities	30,047	23,494
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	93,569	66,541
Available-for-sale Securities, Gross Unrealized Gains	158	149
Available-for-sale Securities, Gross Unrealized Losses	(37)	(167)
Available-for-sale Securities	$ 93,690	$ 66,523