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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Finite-Lived Intangible Assets |  |  |  |
Amortization of Intangible Assets | $ 44,719 | $ 25,784 | $ 91,865 | $ 50,899
Customer inducements |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 3 years |
Customer relationship and customer inducement intangible assets |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Amortization of Intangible Assets | 28,813 | 24,611 | $ 57,619 | 47,410
Leases Acquired In Place and Tenant Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Amortization of Intangible Assets | 7,563 | 0 | 18,401 | 0
Other finite-lived intangible assets |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Amortization of Intangible Assets | 1,659 | 1,173 | 2,844 | 3,489
Permanent withdrawal fees |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Amortization of Intangible Assets | 2,968 | 2,748 | 5,553 | 5,906
Data Center Above and Below Market Leases [Member] |  |  |  |
Finite-Lived Intangible Assets |  |  |  |
Amortization of Intangible Assets | $ 1,293 | $ 0 | $ 2,372 | $ 0

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