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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	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Customer relationships, customer inducements and data center lease-based intangibles	$ 1,495,338	$ 1,506,522
Third-party commissions asset and other finite-lived intangible assets
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	20,290	20,310
Finite-Lived Intangible Assets, Accumulated Amortization	(15,794)	(14,798)
Customer relationships, customer inducements and data center lease-based intangibles	$ 4,496	$ 5,512

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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
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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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