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Schedule I - Financial Information of the Registrant (Parent Company) - Balance Sheets (Additional Information) (Details) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Condensed Balance Sheet Statements, Captions [Line Items]    
Common stock, par value (in usd per share) $ 1 $ 1
Common stock, shares authorized (in shares) 51,500,000 51,500,000
Common stock, shares issued (in shares) 27,080,403 24,061,568
Common stock, shares outstanding (in shares) 26,728,242 23,709,407
Treasury stock, common shares (in shares) 352,161 352,161
Parent company    
Condensed Balance Sheet Statements, Captions [Line Items]    
Common stock, par value (in usd per share) $ 1 $ 1
Common stock, shares authorized (in shares) 51,500,000 51,500,000
Common stock, shares issued (in shares) 27,080,403 24,061,568
Common stock, shares outstanding (in shares) 26,728,242 23,709,407
Treasury stock, common shares (in shares) 352,161 352,161