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Tax Treatment of Distributions - Dividends Tax Treatment (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Capital gains, federal statutory tax rate | 20.00% |  |
Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 1.955 | $ 1.880 | $ 1.760
Tax Treatment, Ordinary income [Member] | Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 1.474 | $ 0.939 | $ 1.474
Dividends paid per common share, percentage | 75.40% | 49.95% | 83.73%
Tax Treatment, Qualified dividend [Member] | Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 0.002 | $ 0.004 | $ 0.003
Dividends paid per common share, percentage | 0.12% | 0.21% | 0.19%
Tax Treatment, Return of capital [Member] | Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 0.162 | $ 0.312 | $ 0.275
Dividends paid per common share, percentage | 8.30% | 16.62% | 15.64%
Tax Treatment, Capital gains [Member] | Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 0.275 | $ 0.600 | $ 0.008
Dividends paid per common share, percentage | 14.05% | 31.93% | 0.44%
Tax Treatment, Unrecaptured section 1250 gains [Member] | Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 0.042 | $ 0.025 | $ 0
Dividends paid per common share, percentage | 2.13% | 1.29% | 0.00%
Tax treatment [Member] | Common Stock [Member] |  |  |
Income Tax Treatment of Dividends Paid [Line Items] |  |  |
Dividends paid per common share (in dollars per share) | $ 1.955 | $ 1.880 | $ 1.760
Dividends paid per common share, percentage | 100.00% | 100.00% | 100.00%

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- Definition Aggregate dividends paid 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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