Condensed Consolidated Statements of Partners' Capital (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018
Regular distributions paid or accrued	$ 0.125	$ 0.125	$ 0.125	$ 0.125	$ 0.125	$ 0.125
Tier 2 [Member]
Distributions paid or accrued of tier 2 and tier 3	0.125	$ 0.125	$ 0.125
Tier 3 [Member]
Distributions paid or accrued of tier 2 and tier 3	$ 0.125

Per-share or per-unit amount of incentive dividend declared and paid to managing member or general partner.

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=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 73
-URI http://asc.fasb.org/extlink&oid=6926462&loc=SL5163674-159010

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 72
-URI http://asc.fasb.org/extlink&oid=6926462&loc=SL5163672-159010

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 103
-URI http://asc.fasb.org/extlink&oid=109243028&loc=SL5199526-159011

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