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Organization - Narrative (Details) ft² in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019 ft² property $ / shares	Jun. 30, 2018	Dec. 31, 2018 $ / shares
Operations [Line Items]
Common stock, par value (usd per share)	$ 0.01		$ 0.01
Number of properties (property) | property	288
Rentable square feet (sqft) | ft²	28.3
Occupancy rate	99.60%
Weighted average remaining lease term	8 years
United States
Operations [Line Items]
Entity-wide revenue percentage	57.60%	55.70%
Europe
Operations [Line Items]
Percentage of portfolio investments	42.40%
Redeemable Preferred Stock
Operations [Line Items]
Preferred stock, dividend rate	7.25%		7.25%
Preferred stock, par value (usd per share)	$ 0.01		$ 0.01

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Entity Wide Revenue, Major State, Percentage

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Portfolio Strategy, Target Geographic Mix, Percentage of Portfolio Investments

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Area of a real estate property.

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Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The number of real estate properties owned as of the balance sheet date.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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-Name Accounting Standards Codification
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