Organization And Description Of Business (Narrative) (Details)	Mar. 31, 2015 property	Dec. 31, 2014 property
Organization and Description of Business [Line Items]
Number of properties owned	130
Common Interest
Organization and Description of Business [Line Items]
Ownership percentage in the Operating Partnership	97.90%
Preferred Interest
Organization and Description of Business [Line Items]
Ownership percentage in the Operating Partnership	100.00%
Joint Ventures
Organization and Description of Business [Line Items]
Number of properties held as investments in unconsolidated joint ventures	14
North America
Organization and Description of Business [Line Items]
Number of properties owned	104
Europe
Organization and Description of Business [Line Items]
Number of properties owned	21
Australia
Organization and Description of Business [Line Items]
Number of properties owned	3
Asia
Organization and Description of Business [Line Items]
Number of properties owned	2
Held-for-sale
Organization and Description of Business [Line Items]
Number of properties	2	5