Pension Plan (Components Of Net Periodic Benefit Expense) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension Plan [Abstract]
Service cost	$ 1,139,000	$ 918,000	$ 3,417,000	$ 2,754,000
Interest cost	992,000	895,000	2,976,000	2,687,000
Expected return on plan assets	(1,885,000)	(1,476,000)	(5,657,000)	(4,390,000)
Amortization of prior service cost	5,000	6,000	15,000	16,000
Recognized net actuarial loss	352,000	269,000	1,057,000	809,000
Benefit expense	603,000	612,000	1,808,000	1,876,000
Pension plan contributions			$ 14,000,000	$ 2,000,000