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Acquisitions (Narrative) (Details)
$ in Thousands
3 Months Ended
Jun. 16, 2015
USD ($)
property
customer
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]      
Amoritization of intangible assets in the remainder of the year   $ 12,200  
Amoritization of intangible assets in 2017   12,200  
Amoritization of intangible assets in 2018   10,100  
Amoritization of intangible assets in 2019   8,000  
Amoritization of intangible assets in 2020   8,000  
Cash consideration paid for acquisition   $ 78,053 $ 73,399
Carpathia Hosting, Inc. [Member]      
Business Acquisition [Line Items]      
Acquisition costs $ 371,400    
Number of customers of acquired entity | customer 230    
Number of domestic data centers acquired | property 8    
Number of international data centers acquired | property 5    
Tax basis of deductible amount of goodwill acquired $ 16,600    
Carpathia Hosting, Inc. [Member] | Carpathia Hosting, Inc. [Member]      
Business Acquisition [Line Items]      
Ownership interest 100.00%