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Equity Cash distributions (Details) - USD ($) $ / shares in Units, $ in Thousands						3 Months Ended		9 Months Ended
	Oct. 25, 2016	Aug. 12, 2016	May 13, 2016	Feb. 12, 2016	Nov. 13, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit, Paid		$ 0.630	$ 0.610	$ 0.590	$ 0.570
Total Quarterly Distribution per Limited Partner Unit, Annualized		$ 2.52	$ 2.44	$ 2.36	$ 2.28
Total Cash Distribution, including IDRs (in thousands)		$ 18,085	$ 17,095	$ 16,124	$ 15,136
Total Quarterly Distribution Per Limited Partner Unit						$ 0.655	$ 0.570	$ 1.895	$ 1.650
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit	$ 0.655
Total Quarterly Distribution Per Limited Partner Unit, Annualized	$ 2.62
Total Cash Distribution, including IDRs (in thousands)	$ 19,302

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- Definition

Per unit of ownership amount of cash distributions declared to be paid to unit-holder of a limited partnership (LP).

+ References

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Annualized per-share or per-unit cash distributions paid to a common shareholder or unit-holder by an LLC or LP.

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- Definition

Amount of equity impact of cash distribution declared to unit-holder of 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
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Amount of cash distribution paid to unit-holder of limited partnership (LP).

+ References

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+ References

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-Section 50
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+ References

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-Topic 505
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