Acquisitions (Narrative) (Details)			6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 16, 2015 USD ($) property customer	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($) ft² a MW	Dec. 31, 2014 USD ($)	Jul. 23, 2014 USD ($)
Business Acquisition [Line Items]
Ownership interest	85.40%		85.40%
Amoritization of intangible assets in the remainder of the year	$ 5,900,000		$ 5,900,000
Amoritization of intangible assets in 2016	10,900,000		10,900,000
Amoritization of intangible assets in 2017	10,900,000		10,900,000
Amoritization of intangible assets in 2018	8,800,000		8,800,000
Amoritization of intangible assets in 2019	6,600,000		6,600,000
Cash consideration paid for acquisition			$ 170,150,000	$ 114,157,000
Carpathia Hosting, Inc. [Member]
Business Acquisition [Line Items]
Ownership interest		100.00%
Acquisition costs		$ 326,000,000
Number of customers of acquired entity | customer		230
Number of domestic data centers acquired | property		8
Number of international data centers acquired | property		5
Issuance of common stock					$ 300,000,000
Revenue since acquisition	3,700,000
Net income since acquisition	$ 200,000
Princeton Facility [Member]
Business Acquisition [Line Items]
Aggregate costs related to acquisition				$ 73,300,000
Acres of real estate property | a				194
Area of facility (in square feet) | ft²				560,000
Lease period			10 years
Renewal of lease period, maximum			15 years
Princeton Facility [Member] | Raised Floor With Twelve MW Gross Power [Member]
Business Acquisition [Line Items]
Area of facility (in square feet) | ft²				58,000
Capacity of the plant (in MW) | MW				12
Common Class A [Member] | Carpathia Hosting, Inc. [Member]
Business Acquisition [Line Items]
Notes issued					$ 387,000,000
Senior Notes [Member]
Business Acquisition [Line Items]
Notes issued						$ 300,000,000