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Income Taxes - Summary of Average Taxable Nature of Dividends (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, common (usd per share) | $ 0.71 | $ 0.7 | $ 0.685
Taxable percentage allocation on dividends | 100.00% | 100.00% | 100.00%
Common [Member] | Ordinary Income [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 87.89% | 59.93% | 96.73%
Common [Member] | 15% Rate, Qualifying Dividend [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.14% | 0.15% | 0.22%
Common [Member] | 15% Rate Gain [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% | 0.00%
Common [Member] | Return of Capital [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 11.97% | 39.92% | 3.05%
Series C Cumulative Redeemable Preferred Shares [Member] |  |  |
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 Cumulative Redeemable Preferred Shares [Member] | Ordinary Income [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 99.84% | 99.75% | 99.78%
Series C Cumulative Redeemable Preferred Shares [Member] | 15% Rate, Qualifying Dividend [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.16% | 0.25% | 0.22%
Series C Cumulative Redeemable Preferred Shares [Member] | 15% Rate Gain [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.00% | 0.00% | 0.00%
Series C Cumulative Redeemable Preferred Shares [Member] | Return of Capital [Member] |  |  |
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=27012166&loc=d3e187085-122770 + Details
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