Annual report pursuant to Section 13 and 15(d)

Shareholders Equity - Shareholder Rights Plan (Details)

v3.20.4
Shareholders Equity - Shareholder Rights Plan (Details) - $ / shares
Mar. 31, 2020
Dec. 31, 2020
Jun. 27, 2020
Dec. 31, 2019
Equity [Abstract]        
Shareholder rights plan, ownership trigger threshold 15.00%      
Right dividend declared, per share of common stock held 1      
Common stock, par value (in dollars per share) $ 1.00 $ 1 $ 1.00 $ 1
Number of shares called by each warrant (in shares)   0.5    
Right, common stock purchase price (in dollars per share) 22.50      
Right, common stock purchase price, full right equivalent (in dollars per share) $ 45.00