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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (USD $)
In Thousands, unless otherwise specified
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Loss
Total
Balance at Dec. 31, 2012 $ 22,014   $ 891,464 $ (14,246) $ 899,232
Balance (in shares) at Dec. 31, 2012 220,144        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issued for stock incentive plans, net 76 1,695 335   2,106
Stock issued for stock incentive plans, net (in shares) 761        
Stock purchased and retired (34) (4,927)     (4,961)
Stock purchased and retired (in shares) (346)        
Net income     35,076   35,076
Pension adjustment, net of taxes       124 124
Foreign currency translation, net of taxes       (244) (244)
Unrealized loss on securities, net of taxes       (61) (61)
Dividends declared     (22,015)   (22,015)
Excess tax benefits for share- based payments   3,232     3,232
Balance at Mar. 31, 2013 $ 22,056   $ 904,860 $ (14,427) $ 912,489
Balance (in shares) at Mar. 31, 2013 220,559