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
Jun. 30, 2019
Dec. 31, 2018
Trade accounts receivable, allowances $ 9,328 $ 9,732
Allowance for Doubtful Other Receivables, Current 4 158
Inventories, reserves 1,159 994
Notes receivable, allowance 996 733
Property and equipment, accumulated depreciation 174,275 170,756
Amortizable intangible assets, accumulated amortization $ 53,402 $ 53,180
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 23,339,327 22,950,066
Common stock, outstanding 21,021,677 20,632,416
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