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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets [Abstract]    
Accounts and other receivables, allowance for doubtful accounts and sales returns $ 3,552 $ 3,539
Common stock, no par value      
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 32,069,370 32,057,281
Common stock, shares outstanding 32,069,370 32,057,281
Common stock held in trust for savings restoration plan, shares 64,654 61,577