Investments (Summary Of Gross Unrealized Gains And Losses And Fair Values) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 141,843	$ 141,003
Available-for-sale Securities, Gross Unrealized Gain	9,543	15,795
Available-for-sale Securities, Gross Unrealized Loss	(83)	(149)
Available-for-sale Securities	151,303	156,649
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	92,977	91,456
Available-for-sale Securities, Gross Unrealized Gain	149	147
Available-for-sale Securities, Gross Unrealized Loss	(81)	(136)
Available-for-sale Securities	93,045	91,467
Debt Securities Issued By The U.S Treasury And Other U.S Government Corporations And Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	26,215	26,848
Available-for-sale Securities, Gross Unrealized Gain	17	9
Available-for-sale Securities, Gross Unrealized Loss	(2)	(13)
Available-for-sale Securities	26,230	26,844
Debt Securities Issued By States Of The United States And Political Subdivisions Of The States [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,040	2,088
Available-for-sale Securities, Gross Unrealized Gain	2	5
Available-for-sale Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities	2,042	2,093
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	20,611	20,611
Available-for-sale Securities, Gross Unrealized Gain	9,375	15,634
Available-for-sale Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities	$ 29,986	$ 36,245