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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts $ 3,297 $ 2,300
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 33,922,433 33,233,614
Treasury stock, shares 3,061,040 3,061,040