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Equity - Preferred Stock Conversion Terms (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2017
5.75% cumulative convertible preferred stock |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate | 5.75% | 5.75%
5.75% cumulative convertible preferred stock series A |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate | 5.75% | 5.75%
4.50% cumulative convertible preferred stock |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate | 4.50% |
5.00% cumulative convertible preferred stock series 2005 B |  |
Class of Stock [Line Items] |  |
Preferred stock, dividend rate | 5.00% | 5.00%
Preferred stock | 5.75% cumulative convertible preferred stock |  |
Class of Stock [Line Items] |  |
Liquidation Preference per Share (in usd per share) | $ 1,000 |
Conversion Rate | 39.6858% |
Conversion Price (in usd per share) | $ 25.1979 |
Company's Market Conversion Trigger (in usd per share) | 32.7573 |
Preferred stock | 5.75% cumulative convertible preferred stock series A |  |
Class of Stock [Line Items] |  |
Liquidation Preference per Share (in usd per share) | $ 1,000 |
Conversion Rate | 38.3508% |
Conversion Price (in usd per share) | $ 26.0751 |
Company's Market Conversion Trigger (in usd per share) | $ 33.8976 |
Preferred stock, dividend rate | 5.75% |
Preferred stock | 4.50% cumulative convertible preferred stock |  |
Class of Stock [Line Items] |  |
Liquidation Preference per Share (in usd per share) | $ 100 |
Conversion Rate | 2.4561% |
Conversion Price (in usd per share) | $ 40.7152 |
Company's Market Conversion Trigger (in usd per share) | 52.9298 |
Preferred stock | 5.00% cumulative convertible preferred stock series 2005 B |  |
Class of Stock [Line Items] |  |
Liquidation Preference per Share (in usd per share) | $ 100 |
Conversion Rate | 2.7745% |
Conversion Price (in usd per share) | $ 36.0431 |
Company's Market Conversion Trigger (in usd per share) | $ 46.8560 |
Preferred stock | Minimum | 4.50% or 5.00% (series 2005B) cumulative convertible preferred stock |  |
Class of Stock [Line Items] |  |
Conversion of stock, market trigger (in shares) | 250,000 |
Preferred stock | Minimum | 5.75% or 5.75% (Series A) preferred stock |  |
Class of Stock [Line Items] |  |
Conversion of stock, market trigger (in shares) | 25,000 |

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