Organization And Description Of Business (Narrative) (Details)	Sep. 30, 2015 property
Organization and Description of Business [Line Items]
Number of properties owned	132
Common Interest
Organization and Description of Business [Line Items]
Ownership percentage in the Operating Partnership	98.00%
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	103
Europe
Organization and Description of Business [Line Items]
Number of properties owned	23
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	3
Held-for-sale
Organization and Description of Business [Line Items]
Number of properties	3
Held-for-sale | Assets Identified for Disposal Subsequent to First Quarter 2015
Organization and Description of Business [Line Items]
Number of properties	8