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Stockholders' Equity Matters - Classification of Dividends Paid (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Percent of dividends paid | 100.00% | 100.00% | 100.00%
Nonqualified ordinary dividends |  |  |
Class of Stock [Line Items] |  |  |
Percent of dividends paid | 43.00% | 54.80% | 83.00%
Qualified ordinary dividends |  |  |
Class of Stock [Line Items] |  |  |
Percent of dividends paid | 0.00% | 4.50% | 4.80%
Capital gains |  |  |
Class of Stock [Line Items] |  |  |
Percent of dividends paid | 49.50% | 14.70% | 5.80%
Return of capital |  |  |
Class of Stock [Line Items] |  |  |
Percent of dividends paid | 7.50% | 26.00% | 6.40%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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