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Equity Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Distributions Earned by Limited or General Partners [Line Items]
General partner's distributions	$ 350	$ 313	$ 692	$ 615
General partner's IDRs	4,258	2,462	8,153	4,446
Total general partner's distributions	4,608	2,775	8,845	5,061
Total limited partners' distributions	17,175	15,310	33,962	30,119
Total cash distributions	$ 21,783	$ 18,085	$ 42,807	$ 35,180
Cash distributions per limited partner unit	$ 0.705	$ 0.630	$ 1.395	$ 1.240
Limited Partner [Member] | Common Units [Member]
Distributions Earned by Limited or General Partners [Line Items]
Total limited partners' distributions	$ 17,175	$ 15,310	$ 33,962	$ 25,695
Limited Partner [Member] | Subordinated Units [Member]
Distributions Earned by Limited or General Partners [Line Items]
Total limited partners' distributions	$ 0	$ 0	$ 0	$ 4,424

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- Definition

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

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

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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

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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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- 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.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 5
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