Pension Plan (Components Of Net Periodic Benefit Expense) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1,204,000	$ 1,068,000	$ 3,612,000	$ 3,204,000
Interest cost	1,056,000	1,012,000	3,168,000	3,036,000
Expected return on plan assets	(2,384,000)	(2,186,000)	(7,152,000)	(6,558,000)
Amortization of prior service cost	5,000	5,000	15,000	15,000
Recognized net actuarial loss	676,000	427,000	2,028,000	1,281,000
Benefit expense	557,000	326,000	1,671,000	978,000
Pension plan contributions			12,600,000	15,900,000
Change in funded status of pension plan, net of income taxes of $222 for nine months ended September 30, 2012	0	0		412,000
Change in pension plan assets and benefit obligations, tax expense (benefit)	$ 0			$ 222,000