Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS [Parenthetical]

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CONSOLIDATED BALANCE SHEETS [Parenthetical] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Trade accounts receivable, allowances $ 11,019 $ 10,420
Allowance for Doubtful Other Receivables, Current 227 260
Inventories, reserves 1,657 2,226
Notes receivable, allowance 759 564
Property and equipment, accumulated depreciation 164,720 156,024
Amortizable intangible assets, accumulated amortization $ 47,179 $ 44,488
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 22,932,451 22,593,130
Common stock, outstanding 20,614,801 20,275,480
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