Partners' Capital (Schedule of Common Units) (Details) - Common Units [Member]	9 Months Ended
Sep. 30, 2020 shares
Class of Stock [Line Items]
Number of common units at December 31, 2019	82,985,941
Phantom unit vesting (in shares)	103,122
Number of common units at June 30, 2020	83,089,063

Number of units issued for unit-based payment arrangement issued by partnership. Partner includes, but is not limited to, general, limited and preferred partners.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Name:	us-gaap_PartnersCapitalAccountUnitsUnitbasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration