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Equity Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Distributions Earned by Limited or General Partners [Line Items]
General partner's distributions	$ 342	$ 302
General partner's IDRs	3,895	1,984
Total general partner's distributions	4,237	2,286
Total limited partners' distributions	16,787	14,809
Total cash distributions	$ 21,024	$ 17,095
Cash distributions per limited partner unit	$ 0.690	$ 0.610
Limited Partner [Member] | Common Units [Member]
Distributions Earned by Limited or General Partners [Line Items]
Total limited partners' distributions	$ 16,787	$ 10,385
Limited Partner [Member] | Subordinated Units [Member]
Distributions Earned by Limited or General Partners [Line Items]
Total limited partners' distributions	$ 0	$ 4,424

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- Definition

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

+ References

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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
-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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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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- 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
-Subparagraph (SX 210.3-04)
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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
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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The total amount of distributions to limited partners.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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