Pension Plan (Components Of Net Periodic Benefit Expense) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1,204,000	$ 1,068,000
Interest cost	1,056,000	1,012,000
Expected return on plan assets	(2,384,000)	(2,186,000)
Amortization of prior service cost	5,000	5,000
Recognized net actuarial loss	676,000	427,000
Benefit expense	557,000	326,000
Pension plan contributions	12,600,000	15,900,000
Change in funded status of pension plan, net of income taxes of $222 for the three months ended March 31, 2012		412,000
Change in pension plan assets and benefit obligations, Tax expense (benefit)	$ 0	$ (222,000)