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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Revenue - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018
Commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized Contract Cost, Amortization Period	3 years
Contract Duration Term	1 year
Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percentage of consolidated revenue	5.00%
Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized Contract Cost, Amortization Period	3 years
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 30,233	$ 30,233

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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