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Stockholders' Equity (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Mar. 29, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Preferred stock | $ 92,000,000 |  | $ 92,000,000 |
Common stock | 59,885,000 |  | 59,885,000 |
Legal surplus | 106,200,000 |  | 103,300,000 |
Stock Repurchase Program Remaining Authorized Repurchase Amount | $ 5,500,000 |  |  |
Stock repurchase program remaining number of shares authorized to be repurchased | 243,609 |  |  |
Stock Repurchase Program Authorized Amount | $ 70,000,000 |  |  |
Share price | $ 22.62 |  |  |
Shares repurchased during period, shares | 0 | 175,000 |  |
Common shares repurchased as part of the stock repurchase program (Value) | $ 0 | $ 2,226,000 |  |
Share repurchased, average price per share |  | $ 12.69 |  |
Preferred stock, redemption price per share |  |  |  | $ 25.00
Preferred Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Preferred Stock Issue Costs | 10,100,000 |  | 10,100,000 |
Common Stock [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Common Stock Issuance Cost | $ 13,600,000 |  | $ 13,600,000 |

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