Pension Plan (Components Of Net Periodic Benefit Expense) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Plan [Abstract]
Service cost	$ 1,139,000	$ 918,000	$ 2,278,000	$ 1,836,000
Interest cost	992,000	896,000	1,984,000	1,792,000
Expected return on plan assets	(1,886,000)	(1,457,000)	(3,772,000)	(2,914,000)
Amortization of prior service cost	5,000	5,000	10,000	10,000
Recognized net actuarial loss	352,000	270,000	705,000	540,000
Benefit expense	602,000	632,000	1,205,000	1,264,000
Pension plan contributions			$ 14,000,000	$ 0