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, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Trade accounts receivable, allowance for doubtful accounts $ 10,437 $ 8,926
Property, plant and equipment, accumulated depreciation 143,408 135,823
Amortizable intangible assets, accumulated amortization 27,196 25,121
Notes receivable, allowance $ 562 $ 702
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 21,675,725 21,312,510
Common stock, outstanding 19,358,075 18,994,860
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