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Stockholders' Equity - Shareholder Rights Plan (Details) | Mar. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares
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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% |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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