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Debt Facilities - Loss on debt Extinguishment (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jul. 31, 2011
Jun. 30, 2009
Sep. 30, 2007
Debt Instrument [Line Items]                  
Loss on debt extinguishment       $ 289 $ 156,990 $ 108,501      
Interest rate (percent)           8.125%      
4.75% Convertible Subordinated Notes [Member]                  
Debt Instrument [Line Items]                  
Interest rate (percent) 4.75% 4.75%   4.75% 4.75% 4.75%      
8.125% senior notes due 2018 [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment           $ 93,602      
Redemption premium           80,925      
Write-off of unamortized debt issuance costs           8,927      
Other transaction-related fees           $ 3,750      
3.00% Convertible Subordinated Notes [Member]                  
Debt Instrument [Line Items]                  
Interest rate (percent) 3.00% 3.00%   3.00% 3.00% 3.00%      
Convertible Subordinated Debt [Member] | 4.75% Convertible Subordinated Notes [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment $ 289     $ 289 $ 46,973        
Interest rate (percent)               4.75%  
Convertible Subordinated Debt [Member] | 3.00% Convertible Subordinated Notes [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment     $ 4,210   51,183        
Interest rate (percent)     3.00%           3.00%
Senior Notes [Member] | 7.00% Senior Notes due 2021 [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment   $ 103,273     103,273        
Interest rate (percent)             7.00%    
Redemption premium         93,965        
Write-off of unamortized debt issuance costs         9,307        
U.S. Financing [Member] | Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Prepayment and termination fees         $ 2,534        
London 4 and 5 IBX data centers [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment           $ 13,189      
New York 5 and 6 IBX data centers [Member]                  
Debt Instrument [Line Items]                  
Loss on debt extinguishment           $ 1,710