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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]        
Allowance for doubtful accounts $ 4,138 $ 3,297    
Preferred stock, par value per share $ 10 $ 10    
Preferred stock, shares authorized 400,000 400,000    
Preferred stock, shares issued   0 0  
Common stock, par value per share $ 10 $ 10    
Common stock, shares authorized 40,000,000 40,000,000    
Common stock, shares issued 34,261,651 33,922,433    
Treasury stock, shares     3,061,040 3,061,040