XML 17 R5.htm IDEA: XBRL DOCUMENT v3.21.2
Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2021
Dec. 31, 2020
Preferred stock, par value $ 0.50 $ 0.50
Common Stock    
Common stock, par value 0.50 0.50
Class B Common Stock    
Common stock, par value $ 0.50 $ 0.50