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Consolidated Statements Of Stockholders' Equity And Comprehensive Income (Parenthetical) (USD $)
In Thousands, except Per Share data
6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Consolidated Statements Of Stockholders' Equity And Comprehensive Income    
Dividends per share $ 0.16 $ 0.3
Tax effect of adjustment to pension liability $ 913 $ 1,051