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Pension Plan (Schedule Of Components Of Net Periodic Cost (Benefit)) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Pension Plan [Abstract]    
Service cost $ 286,000 $ 334,000
Interest cost 1,165,000 1,452,000
Expected return on assets (1,540,000) (1,509,000)
Recognized actuarial loss 1,055,000 744,000
Net periodic pension cost 966,000 1,021,000
Total contributions to pension plan $ 7,100,000