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Pension Plan (Components Of Net Periodic Benefit Expense) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Pension Plan [Abstract]    
Service cost $ 1,068,000 $ 1,139,000
Interest cost 1,012,000 992,000
Expected return on plan assets (2,186,000) (1,886,000)
Amortization of prior service cost 5,000 5,000
Recognized net actuarial loss 427,000 353,000
Benefit expense 326,000 603,000
Pension plan contributions 15,900,000 14,000,000
Change in pension plan assets and benefit obligations, net of income taxes (412,000)  
Change in pension plan assets and benefit obligations, Tax expense (benefit) $ (222,000)