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

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=121586364&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Subsequent Events (Details) - USD ($) $ in Thousands		12 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Jan. 29, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Events [Line Items]
Cash used to acquire businesses, net of cash acquired		$ (590)	$ 74,392	$ 84,580
OTN Systems, N.V. [Member] \| Subsequent Event
Subsequent Events [Line Items]
Cash used to acquire businesses, net of cash acquired	$ 71,000