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Convertible Preferred Stock - Dividends (Details)
9 Months Ended
Sep. 30, 2019
Class of Stock [Line Items]  
Dividend rate (as a percent) 8.00%
Series A Preferred Stock  
Class of Stock [Line Items]  
Original issue price (in dollars per share) 1.30%
Series B Preferred Stock  
Class of Stock [Line Items]  
Original issue price (in dollars per share) 1.73%