Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 266,000	$ 789,000	$ 1,048,000	$ 2,720,000
Interest cost	319,000	725,000	1,257,000	2,615,000
Expected return on plan assets	(453,000)	(405,000)	(1,787,000)	(1,630,000)
Prior service cost	(24,000)	(22,000)	(94,000)	(92,000)
Recognized loss	317,000	151,000	1,251,000	613,000
Total	425,000	1,238,000	1,675,000	4,226,000
Employer contributions to qualified retirement plan			$ 2,500,000	$ 2,200,000