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Organization and Description of Business (Narrative) (Details) - property | Mar. 31, 2018 | Dec. 31, 2017
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Organization and Description of Business [Line Items] |  |
Number of properties | 203 | 205
Common Interest |  |
Organization and Description of Business [Line Items] |  |
Ownership percentage in the Operating Partnership | 95.90% | 96.00%
Preferred Interest |  |
Organization and Description of Business [Line Items] |  |
Ownership percentage in the Operating Partnership | 100.00% | 100.00%
United States |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 151 | 152
Europe |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 37 | 38
Asia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 7 | 7
Australia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 5 | 5
Canada |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 3 | 3
Operating Properties |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 181 | 180
Operating Properties | United States |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 133 | 131
Operating Properties | Europe |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 37 | 38
Operating Properties | Asia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 3 | 3
Operating Properties | Australia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 5 | 5
Operating Properties | Canada |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 3 | 3
Held-for-Sale Properties |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 4 | 7
Held-for-Sale Properties | United States |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 4 | 7
Held-for-Sale Properties | Europe |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0
Held-for-Sale Properties | Asia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0
Held-for-Sale Properties | Australia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0
Held-for-Sale Properties | Canada |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0
Unconsolidated Joint Ventures |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 18 | 18
Unconsolidated Joint Ventures | United States |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 14 | 14
Unconsolidated Joint Ventures | Europe |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0
Unconsolidated Joint Ventures | Asia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 4 | 4
Unconsolidated Joint Ventures | Australia |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0
Unconsolidated Joint Ventures | Canada |  |
Organization and Description of Business [Line Items] |  |
Number of properties | 0 | 0

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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