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Income Taxes - Summary of Average Taxable Nature of Dividends (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Common [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Total dividends per share, common (usd per share) | $ 0.685 | $ 0.68 | $ 0.67
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 | 96.73% | 63.07% | 49.44%
Common [Member] | 15% Rate, Qualifying Dividend [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.22% | 0.00% | 0.05%
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 | 3.05% | 36.93% | 50.51%
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 | 99.78% | 100.00% | 99.90%
Series C Cumulative Redeemable Preferred Shares [Member] | 15% Rate, Qualifying Dividend [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Taxable percentage allocation on dividends | 0.22% | 0.00% | 0.10%
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://www.xbrl.org/2003/role/presentationRef -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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