Organization and Description of Business (Narrative) (Details)	Mar. 31, 2016 property
Organization and Description of Business [Line Items]
Number of properties	140
Common Interest
Organization and Description of Business [Line Items]
Ownership percentage in the Operating Partnership	98.30%
Preferred Interest
Organization and Description of Business [Line Items]
Ownership percentage in the Operating Partnership	100.00%
North America
Organization and Description of Business [Line Items]
Number of properties	109
Europe
Organization and Description of Business [Line Items]
Number of properties	24
Australia
Organization and Description of Business [Line Items]
Number of properties	3
Asia
Organization and Description of Business [Line Items]
Number of properties	4
Telx
Organization and Description of Business [Line Items]
Number of properties	8
Wholly Owned Properties
Organization and Description of Business [Line Items]
Number of properties	2
Leased Properties
Organization and Description of Business [Line Items]
Number of properties	6
Unconsolidated Properties
Organization and Description of Business [Line Items]
Number of properties	14