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Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Distributions Earned by Limited or General Partners [Line Items]
General partner's distributions	$ 383	$ 350
General partner's IDRs	5,817	4,258	$ 11,154	$ 8,153
Total general partner's distributions	6,200	4,608	11,910	8,845
Common limited partners' distributions	18,784	17,175	37,071	33,962
Total cash distributions	$ 24,984	$ 21,783	$ 48,981	$ 42,807
Cash distributions per limited partner unit (in dollars per share)	$ 0.770	$ 0.705	$ 1.52	$ 1.3950
General Partner
Distributions Earned by Limited or General Partners [Line Items]
General partner's distributions			$ 756	$ 692
General partner's IDRs			$ 11,154	$ 8,153

X

- Definition

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

+ References

No definition available.

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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

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

+ References

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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)
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-Section 50
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-Section 50
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- Definition

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

+ References

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-Publisher FASB
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-Topic 505
-SubTopic 10
-Section S99
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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
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- Definition

The total amount of distributions to limited partners.

+ References

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