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Summary of Significant Accounting Policies - Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 50,609 | $ 44,719 | $ 98,481 | $ 91,865
Customer relationship and customer inducement intangible assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 28,283 | 28,813 | 56,164 | 57,619
Data center in-place leases and tenant relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 11,372 | 7,563 | 23,981 | 18,401
Third-party commissions asset and other finite-lived intangible assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 2,184 | 1,659 | 2,941 | 2,844
Customer inducements |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 2,598 | 2,968 | 5,338 | 5,553
Data center above-market leases and data center below-market leases |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 935 | $ 1,293 | $ 1,840 | $ 2,372

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