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