Assets Held for Sale (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets	$ 33,257,000	$ 0
Total liabilities	(3,535,000)	0
Held-for-sale [Member] | London 2 Data Center in London, UK (LD2) and San Jose Land Parcel [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	17,579,000	21,772,000
Net income	7,166,000	$ 9,218,000
Accounts Receivable	2,222,000
Other current assets	408,000
Property, plant and equipment	23,533,000
Goodwill	5,000,000
Intangible assets	784,000
Other assets	1,310,000
Total assets	33,257,000
Accounts payable and accrued expenses	(654,000)
Accrued property, plant and equipment	(816,000)
Other current liabilities	(435,000)
Other liabilities	(1,630,000)
Total liabilities	$ (3,535,000)