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Pension Plan (Schedule Of Components Of Net Periodic Cost (Benefit)) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Plan [Abstract]      
Service cost $ 1,162 $ 1,140 $ 1,191
Interest cost 5,047 4,958 4,834
Expected return on plan assets (6,566) (5,151) (3,927)
Recognized actuarial loss 2,427 2,538 4,676
Net periodic cost $ 2,070 $ 3,485 $ 6,774