Revenue Revenue, Remaining Performance Obligation (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Revenue [Abstract]
Anticipated recognition of revenue for the remainder of 2018	$ 2,445
Anticipated recognition of revenue in 2019	7,774
Anticipated recognition of revenue in 2020	6,282
Anticipated recognition of revenue in 2021	5,749
Anticipated recognition of revenue in 2022	5,559
Anticipated recognition of revenue thereafter	75,203
Revenue, Remaining Performance Obligation	$ 103,012

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant