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
Mar. 31, 2020
Dec. 31, 2019
Trade accounts receivable, allowances $ 11,408 $ 10,947
Inventories, reserves 1,431 1,271
Notes receivable, allowance 930 954
Property and equipment, accumulated depreciation 175,212 173,122
Amortizable intangible assets, accumulated amortization $ 56,604 $ 55,617
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 23,447,317 23,447,317
Common stock, outstanding 21,129,667 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