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Consolidated Statement of Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class A common shares/units
Offering costs	$ 9,200	$ 400	$ 0	$ 10,637	$ 227
Common Stock
Dividends declared on common shares (in dollars per unit)			$ 0.2	$ 0.2	$ 0.20
Common Stock | Class A common shares/units
Offering costs				$ 10,904
Preferred shares
Offering costs			$ 4,022	$ 9,355	$ 15,996

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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