Consolidated Statements of Changes in Equity and Other Comprehensive Income (Parenthetical) $ in Thousands	Sep. 30, 2018 USD ($)
Increase (decrease) in shareholders' equity
Offering costs	$ 219

Costs incurred in connection with the offering and selling of additional partner interest.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 5.D.Q1)
-URI http://asc.fasb.org/extlink&oid=6488002&loc=d3e600348-122990

Name:	us-gaap_OfferingCostsPartnershipInterests
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant