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Distributions Paid and Payable - Common Stock (Details) - Common stock - $ / shares | 1 Months Ended | 3 Months Ended
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Mar. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Distributions Paid and Payable |  |  |  |  |  |  |  |
Total common stock dividends paid per share (in dollars per share) | $ 0.2190 | $ 0.2190 | $ 0.2125 | $ 0.2105 | $ 0.2105 | $ 0.2025 | $ 0.6505 | $ 0.6235
Monthly distributions payable (in dollars per share) | $ 0.2195 |  |  |  |  |  | $ 0.2195 |

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- Definition Aggregate dividends paid 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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