CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowances (in dollars)	$ 15,737	$ 13,226
Other accounts receivable, allowances (in dollars)	$ 697	$ 690
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	70,000,000	70,000,000
Common stock, issued shares	29,384,711	29,359,597
Treasury stock, at cost, shares	4,900,512	4,492,514