Amount of cash distribution paid to unit-holder of limited partnership (LP).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

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 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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-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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of incentive obligation paid in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner.

+ References

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Partnership Distributions - Summary of Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Oct. 26, 2017	Sep. 30, 2016	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Distribution Made to Limited Partner [Line Items]
Distribution ($ per unit)			$ 0.5110	$ 0.4883	$ 0.4665	$ 0.4457	$ 0.4108	$ 0.4333
Distributions			$ 21,048	$ 19,851	$ 16,971	$ 16,089	$ 13,066	$ 13,782
Incentive distribution			819	520	223	92	0	$ 0
Common Units
Distribution Made to Limited Partner [Line Items]
Distribution ($ per unit)	$ 0.5348	$ 0.0408						$ 0.3925
Distributions			12,103	11,566	9,330	8,909	6,533	$ 6,891
Subordinated Units
Distribution Made to Limited Partner [Line Items]
Distributions			$ 8,126	$ 7,765	$ 7,418	$ 7,088	$ 6,533	$ 6,891