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Stockholders' Equity (Stock Repurchase Program) (Details) - USD ($) | 2 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Nov. 02, 2020 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 250,000,000 |
Number of shares authorized to be repurchased under the Repurchase Program (in shares) |  |  |  | 10,000,000.0
Number of remaining shares authorized to be repurchased under the Repurchase Program (in shares) |  |  |  | 6,600,000
Shares repurchased and retired (in shares) |  | 5,946,678 |  |
Average cost per share (usd per share) |  | $ 4.09 |  |
Cost for shares repurchased |  | $ 24,300,000 |  |
Payments for fees and commissions paid to the sales agent |  | $ 59,000 |  |
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock repurchase program, authorized amount | $ 121,200,000 |  |  |
Shares repurchased and retired (in shares) | 10,778,896 |  |  |
Average cost per share (usd per share) | $ 4.14 |  |  |

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