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Fair Value - Level 3 Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Participating preferred shares derivative liability
Preferred shares derivative liability beginning balance	$ 69,810	$ 62,790
Conversions	(37,499)	0
Remeasurement included in earnings	(2,841)	7,020
Preferred shares derivative liability ending balance	29,470	69,810
Contingently convertible Series E units liability
Contingently convertible Series E units liability beginning balance	$ 0	69,957
Conversions		(58,494)
Remeasurement included in earnings		(11,463)
Contingently convertible Series E units liability end balance		$ 0

X

- Definition

Contingent Convertible Liability Remeasurement

+ References

No definition available.

+ Details

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X

- Definition

Contingently convertible [Abstract]

+ References

No definition available.

+ Details

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X

- Definition

Fair value of Series E convertible units that represent non-voting interests in the Operating Partnership that may be settled into a variable number of Series D units or Class A units on a specified date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of expense (income) related to adjustment to fair value of preferred derivative liability.

+ References

No definition available.

+ Details

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X

- Definition

Preferred shares derivative [Abstract]

+ References

No definition available.

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X

- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

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X

- Definition

The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the fair value of securities issuable pursuant to the original conversion terms, during the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695

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X

- Definition

Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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