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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 47,146	$ 25,115
Customer relationship intangible assets
Finite-Lived Intangible Assets
Amortization of Intangible Assets	26,337	20,133
Customer inducements
Finite-Lived Intangible Assets
Amortization of Intangible Assets	2,469	2,666
Leases Acquired In Place and Tenant Relationships [Member]
Finite-Lived Intangible Assets
Amortization of Intangible Assets	10,838	0
Other finite-lived intangible assets
Finite-Lived Intangible Assets
Amortization of Intangible Assets	1,185	2,316
Permanent withdrawal fees
Finite-Lived Intangible Assets
Amortization of Intangible Assets	2,585	3,158
Data Center Above and Below Market Leases [Member]
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 1,079	$ 0

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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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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+ References

No definition available.

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