Financial Instruments And Investments (Sale Of Securities And The Related Effects On Pre-Tax Income ) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investment [Line Items]
Proceeds from sales of available-for-sale securities	$ 56,148	$ 98,542	$ 82,926
Gross realized gains included in pre-tax income	986	1,478	1,479
Gross realized losses included in pre-tax income	(433)	(2,041)	(721)
Other than Temporary Impairment Losses, Investments, Recognized in Earnings, before Tax, Available-for-sale Securities	0	(479)	(2,116)
Net unrealized holding gains (losses) included in accumulated other comprehensive income	17,699	9,927	1,570
Net gains (losses) in pre-tax income	(553)	1,042	1,358
Net gains (losses) in other comprehensive income	$ 17,146	$ 10,969	$ 2,928