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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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