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Summary of Significant Accounting Policies - Investments Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Frankfurt JV
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 26,257	$ 26,500
Ownership percentage	20.00%	20.00%
Makespace
Schedule of Equity Method Investments [Line Items]
Equity investments	$ 21,075	$ 16,924
Ownership percentage	42.00%	39.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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