Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data
Sep. 30, 2011
Dec. 31, 2010
Trade accounts receivable, allowance for doubtful accounts $ 10,244 $ 10,040
Property, plant and equipment, accumulated depreciation 123,214 117,212
Amortizable intangible assets, accumulated amortization $ 22,414 $ 20,496
Treasury stock, shares 2,317,650 2,317,650
Class A Common Stock
   
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 80,000,000 80,000,000
Common stock, issued 21,043,205 21,000,193
Common stock, outstanding 18,725,555 18,682,543
Class B Common stock
   
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 20,000,000 20,000,000
Common stock, issued 5,553,696 5,553,696
Common stock, outstanding 5,553,696 5,553,696