Financial Instruments And Investments (Sale Of Securities And The Related Effects On Pre-Tax Income ) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investment [Line Items]
Proceeds from sales of available-for-sale securities	$ 10,980	$ 7,057	$ 47,355	$ 29,419	$ 74,083	$ 53,866
Gross realized gains included in pre-tax income	1,239	212	4,502	593	4,895	814
Gross realized losses included in pre-tax income	(415)	(13)	(711)	(306)	(838)	(340)
Other than temporary impairment losses, recognized in earnings before tax	0	0	0	0	0	(313)
Net unrealized holding gains (losses) included in accumulated other comprehensive income	897	4,300	7,965	8,861	16,803	6,802
Net gains (losses) in pre-tax income	824	199	3,791	287	4,057	161
Net gains (losses) in other comprehensive income	$ 73	$ 4,101	$ 4,174	$ 8,574	$ 12,746	$ 6,641