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Equity Net income applicable to partners (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Net income attributable to partners	$ 69,409	$ 62,804	$ 66,848
Less: General partner's IDRs	(17,389)	(11,160)	(3,904)
Net income available to partners	$ 52,020	$ 51,644	$ 62,944
General partner's ownership interest	2.00%	2.00%	2.00%
General partner's allocated interest in net income	$ 1,040	$ 1,033	$ 1,259
General partner's IDRs	17,389	11,160	3,904
Total general partner's interest in net income	$ 18,429	$ 12,193	$ 5,163

X

- Definition

Amount of net income allocated to the general partner, excluding incentive distribution rights.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate amount of net income attributable to the partners, which excludes the amount of net income attributable to predecessor entities.

+ References

No definition available.

+ Details

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X

- Definition

Net income after adjustments for Incentive Distribution Rights of the general partner.

+ References

No definition available.

+ Details

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- References

No definition available.

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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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- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or 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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X

- Definition

Aggregate amount of net income allocated to general partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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