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Stockholders' Equity Preferred stock (Details) - $ / shares | Dec. 31, 2020 | Dec. 31, 2019
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Class of Stock [Line Items] |  |
Preferred Stock, Shares Authorized | 15,000,000 | 15,000,000
Preferred Stock, Par or Stated Value Per Share | $ 1.00 | $ 1.00

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