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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Schedule Of Other Finite-Lived Intangile Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Customer relationships, customer inducements and data center lease-based intangibles	$ 1,530,549	$ 1,400,547
Other finite-lived intangible assets
Finite-Lived Intangible Assets
Amortization period	4 years
Finite-Lived Intangible Assets, Gross	$ 20,365	20,929
Finite-Lived Intangible Assets, Accumulated Amortization	(12,611)	(10,728)
Customer relationships, customer inducements and data center lease-based intangibles	$ 7,754	$ 10,201

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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