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Organization - Narrative (Details) ft² in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 ft² property $ / shares | Mar. 31, 2018 | Dec. 31, 2018 $ / shares
Operations [Line Items] |  |  |
Common stock, par value (usd per share) | $ 0.01 |  | $ 0.01
Number of properties (property) | property | 343 |  |
Rentable square feet (sqft) | ft² | 27.4 |  |
Occupancy rate | 99.50% |  |
Lessor, Average Remaining Lease Term | 8 years 1 month |  |
United States |  |  |
Operations [Line Items] |  |  |
Entity-wide revenue percentage | 55.80% | 55.70% |
Europe |  |  |
Operations [Line Items] |  |  |
Percentage of portfolio investments | 44.20% |  |
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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