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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 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Finite-Lived Intangible Assets, Net Carrying Amount | $ 1,530,549 | $ 1,400,547
Customer relationship intangible assets |  |
Assets: |  |
Finite-Lived Intangible Assets, Gross | 1,690,147 | 1,704,105
Finite-Lived Intangible Assets, Accumulated Amortization | (436,076) | (395,278)
Finite-Lived Intangible Assets, Net Carrying Amount | 1,254,071 | 1,308,827
Customer inducements |  |
Assets: |  |
Finite-Lived Intangible Assets, Gross | 57,555 | 140,030
Finite-Lived Intangible Assets, Accumulated Amortization | (35,430) | (66,981)
Finite-Lived Intangible Assets, Net Carrying Amount | 22,125 | 73,049
Data center lease-based intangible assets |  |
Assets: |  |
Finite-Lived Intangible Assets, Gross | 276,936 | 19,314
Finite-Lived Intangible Assets, Accumulated Amortization | (22,583) | (643)
Finite-Lived Intangible Assets, Net Carrying Amount | 254,353 | 18,671
Liabilities: |  |
Data center Below Market Lease, Gross Carrying Amount | 12,338 | 0
Below Market Lease, Accumulated Amortization | (761) | 0
Below Market Lease, Net Carrying Amount | 11,577 | 0
Customer relationships, customer inducements and data center |  |
Assets: |  |
Finite-Lived Intangible Assets, Gross | 2,024,638 | 1,863,449
Finite-Lived Intangible Assets, Accumulated Amortization | (494,089) | (462,902)
Finite-Lived Intangible Assets, Net Carrying Amount | $ 1,530,549 | $ 1,400,547

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