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Income Taxes - Summary of Average Taxable Nature of Dividends (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, common (usd per share) | $ 0.420 | $ 0.485 | $ 0.710
Taxable percentage allocation on dividends | 100.00% | 100.00% | 100.00%
Common Stock | Ordinary income |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 95.10% | 61.07% | 87.89%
Common Stock | Qualifying dividend |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.60% | 0.22% | 0.14%
Common Stock | Capital gain |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% | 0.00%
Common Stock | Return of capital |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 4.30% | 38.71% | 11.97%
Series C |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, preferred (usd per share) | $ 3.25 | $ 3.25 | $ 3.25
Taxable percentage allocation on dividends | 100.00% | 100.00% | 100.00%
Series C | Ordinary income |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 99.38% | 99.64% | 99.84%
Series C | Qualifying dividend |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.62% | 0.36% | 0.16%
Series C | Capital gain |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% | 0.00%
Series C | Return of capital |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% | 0.00%

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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