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Significant Accounting Policies - Preferred Stock (Details) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Significant Accounting Policies    
Preferred Stock, Shares Authorized 1,000,000 1,000,000
Preferred stock, par value (in dollars per share) $ 0.10 $ 0.10
Preferred stock, shares issued (in shares) 0 0