Organization and Description of Business (Narrative) (Details)	Dec. 31, 2015 property
Organization and Description of Business [Line Items]
Number of real estate properties	139
Common Interest
Organization and Description of Business [Line Items]
Ownership percentage in the Operating Partnership	98.10%
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 real estate properties	110
Europe
Organization and Description of Business [Line Items]
Number of real estate properties	23
Australia
Organization and Description of Business [Line Items]
Number of real estate properties	3
Asia
Organization and Description of Business [Line Items]
Number of real estate properties	3
Telx
Organization and Description of Business [Line Items]
Number of real estate properties	8
Wholly Owned Properties
Organization and Description of Business [Line Items]
Number of real estate properties	2
Leased Properties
Organization and Description of Business [Line Items]
Number of real estate properties	6
Unconsolidated Properties
Organization and Description of Business [Line Items]
Number of real estate properties	14