Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Shareholder Rights Plan (Details)

v3.20.1
Stockholders' Equity - Shareholder Rights Plan (Details)
Mar. 31, 2020
$ / shares
shares
Dec. 31, 2019
$ / shares
Class of Warrant or Right [Line Items]    
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
Number of securities called by each right (in shares) | shares 0.5  
Right, Common Stock purchase price (in USD per share) $ 22.50  
Right, Common Stock purchase price, full right equivalent (USD per share) $ 45.00  
Stockholder Rights Plan, exchange option, maximum ownership percentage 50.00%  
Shareholder Rights Plan, sale of assets percentage, triggering event 50.00%  
Shareholder Rights Plan, earning power or cash flow, triggering event, percentage 50.00%  
Shareholders Right Plan, Common Stock ownership percentage required to request board of director resolution 10.00%  
Shareholders Right Plan, Common Stock ownership percentage in which ownership will be grandfathered 15.00%