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Distributions Paid and Payable - Common Stock (Details) - $ / shares | 1 Months Ended | 6 Months Ended
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Jun. 30, 2018 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Distributions Paid and Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly distributions payable (in dollars per share) | $ 0.22 |  |  |  |  |  |  |  |  |  |  |  | $ 0.22 |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions Paid and Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total common stock dividends paid per share (in dollars per share) | $ 0.2195 | $ 0.2195 | $ 0.2195 | $ 0.219 | $ 0.219 | $ 0.2125 | $ 0.211 | $ 0.211 | $ 0.211 | $ 0.2105 | $ 0.2105 | $ 0.2025 | $ 1.309 | $ 1.2565

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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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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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