The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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

Subsequent Event (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
Subsequent Event (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross			$ 157	$ 0
Bolt [Member] [Member]
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$ 32,300	$ 5,200