Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,314	$ 3,335	$ 3,325
Interest cost	1,578	3,454	3,212
Expected return on plan assets	(2,249)	(2,229)	(1,965)
Prior service cost	(117)	(117)	(117)
Recognized loss	1,569	685	744
Total	$ 2,095	$ 5,128	$ 5,199