Employee Benefits (Retirement Plans And Other Postretirement Benefits) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Retirement Income Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,166	$ 2,207	$ 6,996	$ 6,621	$ 9,204	$ 8,334
Interest cost	3,410	3,389	10,210	10,167	13,600	13,663
Expected return on plan assets	(4,281)	(3,611)	(12,831)	(10,832)	(16,442)	(14,356)
Amortization of net (gain) loss	2,903	2,839	8,323	8,517	11,162	10,153
Amortization of Prior Service Cost (Credit)	23	29	73	87	101	115
Net periodic benefit cost	4,221	4,853	12,771	14,560	17,625	17,909
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	972	1,095	3,172	3,284	4,266	4,031
Interest cost	1,292	1,413	4,042	4,238	5,455	5,583
Expected return on plan assets	(485)	(397)	(1,435)	(1,285)	(1,864)	(1,741)
Amortization of net (gain) loss	0	154	0	461	154	452
Amortization of Prior Service Cost (Credit)	(1,392)	(1,470)	(4,242)	(4,408)	(5,711)	(5,890)
Net periodic benefit cost	$ 387	$ 795	$ 1,537	$ 2,290	$ 2,300	$ 2,435