Aggregate dividends declared during the period for each share of common stock outstanding.

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

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- Definition

Capital Gain Distributions, Percentage of Dividends

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- Definition

Dividends, Authorized Annual Dividends, Per Share

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- Definition

The percentage total of the characterized distributions for the period.

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- Definition

The percentage of total distributions for the period that are characterized as nontaxable distributions.

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- Definition

The percentage of total distributions for the period that are characterized as ordinary dividends.

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Equity - Common Stock Dividends (Details) - $ / shares		3 Months Ended									12 Months Ended
Equity - Common Stock Dividends (Details) - $ / shares	Nov. 01, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Quarterly dividend of common stock declared (in dollars per share)	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.1375	$ 0.55	$ 0.55	$ 0.28
Annualized dividend rate (in dollars per share)					$ 0.55				$ 0.55		$ 0.55	$ 0.55	$ 0.55
Ordinary dividends											60.00%	95.00%	75.90%
Nondividend distributions											37.00%	0.00%	0.00%
Capital gain distributions											3.00%	5.00%	24.10%
Total											100.00%	100.00%	100.00%