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, 2021
Dec. 31, 2020
Trade accounts receivable, allowances $ 14,498 $ 14,069
Other receivables 455 124
Inventories, reserves 1,508 1,499
Notes receivable, allowance 815 461
Property and equipment, accumulated depreciation 184,521 180,336
Amortizable intangible assets, accumulated amortization $ 58,476 $ 58,897
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 23,633,099 23,447,317
Common stock, outstanding 21,315,449 21,129,667
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