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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
Mar. 31, 2018
Dec. 31, 2017
Customer relationship intangible assets    
Assets:    
Finite-Lived Intangible Assets, Gross $ 1,728,685 $ 1,704,105
Finite-Lived Intangible Assets, Accumulated Amortization (427,550) (395,278)
Finite-Lived Intangible Assets, Net Carrying Amount 1,301,135 1,308,827
Customer inducements    
Assets:    
Finite-Lived Intangible Assets, Gross 57,502 140,030
Finite-Lived Intangible Assets, Accumulated Amortization (35,149) (66,981)
Finite-Lived Intangible Assets, Net Carrying Amount 22,353 73,049
Data center lease-based intangible assets    
Assets:    
Finite-Lived Intangible Assets, Gross 282,609 19,314
Finite-Lived Intangible Assets, Accumulated Amortization (13,609) (643)
Finite-Lived Intangible Assets, Net Carrying Amount 269,000 18,671
Liabilities:    
Data center Below Market Lease, Gross Carrying Amount 11,421 0
Below Market Lease, Accumulated Amortization (349) 0
Below Market Lease, Net Carrying Amount 11,072 0
Customer relationships, customer inducements and data center    
Assets:    
Finite-Lived Intangible Assets, Gross 2,068,796 1,863,449
Finite-Lived Intangible Assets, Accumulated Amortization (476,308) (462,902)
Finite-Lived Intangible Assets, Net Carrying Amount $ 1,592,488 $ 1,400,547