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Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity [Abstract]
General partner's distributions	$ 439	$ 393	$ 1,269	$ 1,149
General partner's IDRs	8,453	6,295	23,206	17,449
Total general partner's distributions	8,892	6,688	24,475	18,598
Common limited partners' distributions	21,487	19,272	62,256	56,343
Total cash distributions	$ 30,379	$ 25,960	$ 86,731	$ 74,941
Cash distributions per limited partner unit (in dollars per share)	$ 0.880	$ 0.790	$ 2.550	$ 2.310

X

- Definition

The amount of cash distributions declared to partners by a limited partnership.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The total amount of distributions to the general partner during the period, including IDRs.

+ References

No definition available.

+ Details

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X

- 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

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-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
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-Topic 272
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-Section 50
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- References

No definition available.

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- Definition

The total amount of distributions to the general partner during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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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

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)
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- Definition

The total amount of distributions to limited partners.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
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