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Consolidated Statement Of Changes In Retained Earnings And Other Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Statement of Stockholders' Equity [Abstract]      
Pension and post-retirement plan adjustments, tax $ 28,636 $ 205 $ 6,533