Condensed Consolidated Statements of Stockholder's Equity (Parenthetical) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
May 31, 2018	Feb. 28, 2018	May 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Capital contribution	$ 840	$ 848	$ 76,429	$ 1,688	$ 76,429

The cash inflow associated with the amount received by a corporation from a shareholder during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromContributedCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration