The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended
Acquisitions (Narrative) (Details) - USD ($) $ in Thousands	Nov. 13, 2018	Feb. 06, 2018	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cash paid for acquisitions, net of cash acquired			$ 0	$ 66,330
Sapho, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Cash paid for acquisitions, net of cash acquired	$ 182,900
Cash acquired in business combination	$ 3,700
Cedexis, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Cash paid for acquisitions, net of cash acquired		$ 66,000
Cash acquired in business combination		$ 6,000