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Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Distributions Earned by Limited or General Partners [Line Items]
General partner's IDRs	$ 5,337	$ 3,895
Total general partner's distributions	5,710	4,237
Common limited partners' distributions	18,287	16,787
Total cash distributions	$ 23,997	$ 21,024
Cash distributions per limited partner unit (in dollars per share)	$ 0.75	$ 0.69
General Partner
Distributions Earned by Limited or General Partners [Line Items]
General partner's distributions	$ 373	$ 342
General partner's IDRs	$ 5,337	$ 3,895

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- Definition

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

+ References

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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.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
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- Definition

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

+ References

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-Name Accounting Standards Codification
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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The total amount of distributions to limited partners.

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