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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Schedule of Components of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Assets:    
Finite-Lived Intangible Assets, Net Carrying Amount $ 1,516,851 $ 1,400,547
Customer relationship intangible assets    
Assets:    
Finite-Lived Intangible Assets, Gross 1,693,426 1,704,105
Finite-Lived Intangible Assets, Accumulated Amortization (439,048) (395,278)
Finite-Lived Intangible Assets, Net Carrying Amount $ 1,254,378 1,308,827
Customer inducements    
Finite-Lived Intangible Assets    
Finite-Lived Intangible Asset, Useful Life 3 years  
Assets:    
Finite-Lived Intangible Assets, Gross $ 56,288 140,030
Finite-Lived Intangible Assets, Accumulated Amortization (34,374) (66,981)
Finite-Lived Intangible Assets, Net Carrying Amount 21,914 73,049
Data center lease-based intangible assets    
Assets:    
Finite-Lived Intangible Assets, Gross 276,565 19,314
Finite-Lived Intangible Assets, Accumulated Amortization (36,006) (643)
Finite-Lived Intangible Assets, Net Carrying Amount 240,559 18,671
Liabilities:    
Data center Below Market Lease, Gross Carrying Amount 12,355 0
Below Market Lease, Accumulated Amortization (1,231) 0
Below Market Lease, Net Carrying Amount 11,124 0
Customer relationships, customer inducements and data center    
Assets:    
Finite-Lived Intangible Assets, Gross 2,026,279 1,863,449
Finite-Lived Intangible Assets, Accumulated Amortization (509,428) (462,902)
Finite-Lived Intangible Assets, Net Carrying Amount $ 1,516,851 $ 1,400,547