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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowances (in dollars) $ 7,837 $ 7,657
Other accounts receivable, allowances (in dollars) $ 936 $ 921
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 28,498,971 28,495,628
Treasury stock, at cost, shares 2,857,460 2,851,578