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Business Acquisition (Details) - USD ($) $ in Thousands	2 Months Ended	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Oct. 18, 2017
Less:
Recorded goodwill	$ 1,876,132	$ 1,838,909
AOC
Business Acquisition [Line Items]
Total consideration	129,828	129,828	$ 129,800
Less:
Cash	15,546	15,546
Accounts receivable	4,171	4,271
Property and equipment	2,530	1,201
Other liabilities	(685)	(1,457)
Recorded goodwill	67,706	47,897
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Total consideration		0
Cash		0
Accounts receivable		100
Property and equipment		(1,329)
Other liabilities		(772)
Recorded goodwill		$ (19,809)
Weighted average life (in years)		5 years 6 months
Total revenues	6,700
Net loss before taxes	600
Customer relationships | AOC
Less:
Intangible assets	15,000	$ 15,200
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Intangible assets		$ 200
Weighted average life (in years)		9 years
Developed technologies | AOC
Less:
Intangible assets	24,100	$ 24,100
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Intangible assets		$ 0
Weighted average life (in years)		3 years 4 months 24 days
Trademarks and trade names | AOC
Less:
Intangible assets	1,460	$ 1,470
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Intangible assets		$ 10
Weighted average life (in years)		4 years 3 months 18 days
In Process Research and Development | AOC
Less:
In-process research and development	$ 0	$ 21,600
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]
Intangible assets		$ 21,600

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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