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Equity (Dividends) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Dividends [Abstract]
Minimum percentage of taxable income (excluding net capital gains) to be distributed in order to qualify as REIT	90.00%
Percentage of taxable income (including net capital gains) to be distributed in order to qualify as REIT	100.00%
Operating loss carryforwards		$ 588.0	$ 948.8

X

- Definition

Represents the minimum percentage of taxable income (excluding capital gains) to be distributed in order to qualify as REIT.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of taxable income (including capital gains) to be distributed in order to qualify as REIT.

+ References

No definition available.

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

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