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Summary of Significant Accounting Policies - Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 49,409 | $ 44,807 | $ 147,890 | $ 136,672
Customer relationship and customer inducement intangible assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 29,064 | 26,782 | 85,228 | 84,401
Data center in-place leases and tenant relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 11,356 | 12,036 | 35,337 | 30,437
Third-party commissions asset and other finite-lived intangible assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 2,515 | 642 | 5,456 | 3,486
Customer inducements |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 2,303 | 3,229 | 7,641 | 8,782
Data center above-market leases and data center below-market leases |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 936 | $ 1,276 | $ 2,776 | $ 3,648

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