Pension Plan (Components Of Net Periodic Benefit Expense) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1,068,000	$ 1,139,000	$ 2,136,000	$ 2,278,000
Interest cost	1,012,000	992,000	2,024,000	1,984,000
Expected return on plan assets	(2,186,000)	(1,886,000)	(4,372,000)	(3,772,000)
Amortization of prior service cost	5,000	5,000	10,000	10,000
Recognized net actuarial loss	427,000	352,000	854,000	705,000
Benefit expense	326,000	602,000	652,000	1,205,000
Pension plan contributions			15,900,000	14,000,000
Change in funded status of pension plan, net of income taxes of $222	0	0	412,000
Change in pension plan assets and benefit obligations, Tax expense (benefit)	$ 0	$ 0	$ (222,000)