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Summary of Significant Accounting Policies - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 48,884	$ 47,872
Customer relationship and customer inducement intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	26,764	27,881
Data center in-place leases and tenant relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	11,353	12,609
Third-party commissions asset and other finite-lived intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	2,363	757
Permanent withdrawal fees
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	2,465	2,740
Data center above-market leases and data center below-market leases
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 217	$ 905

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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