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Equity - Distributions Earned (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Distributions Earned by Limited or General Partners [Line Items]
General partner's distributions	$ 356	$ 325	$ 1,048	$ 940
General partner's IDRs	4,496	3,057	12,649	7,503
Total general partner's distributions	4,852	3,382	13,697	8,443
Total limited partners' distributions	17,418	15,920	51,380	46,039
Total cash distributions	$ 22,270	$ 19,302	$ 65,077	$ 54,482
Cash distributions per limited partner unit (in dollars per share)	$ 0.715	$ 0.655	$ 2.110	$ 1.895
Limited Partner [Member] | Common Units [Member]
Distributions Earned by Limited or General Partners [Line Items]
Total limited partners' distributions	$ 17,418	$ 15,920	$ 51,380	$ 41,615
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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- Definition

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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-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
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