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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

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

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-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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