Consolidated Balance Sheets (Parenthetical) - shares	Sep. 30, 2019	Dec. 31, 2018
Common Units [Member]
Equity:
Limited partners' capital account, units issued (in shares)	82,750,201	82,665,057
Limited Partners' Capital Account, Units Outstanding	82,750,201	82,665,057
Class C Units - Held by Subsidiary [Member]
Equity:
Limited partners' capital account, units issued (in shares)	16,410,780	16,410,780
Limited Partners' Capital Account, Units Outstanding	16,410,780	16,410,780

The number of limited partner units outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant