Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Trade accounts receivable, allowances $ 10,764 $ 11,019
Allowance for Doubtful Other Receivables, Current 163 227
Inventories, reserves 796 1,657
Notes receivable, allowance 748 759
Property and equipment, accumulated depreciation 167,934 164,720
Amortizable intangible assets, accumulated amortization $ 51,545 $ 47,179
Treasury stock, shares 2,317,650 2,317,650
Common Class A [Member]    
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 80,000,000 80,000,000
Common stock, issued 22,950,066 22,932,451
Common stock, outstanding 20,632,416 20,614,801
Common Class B [Member]    
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