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Equity - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 13, 2018	May 07, 2018	Feb. 12, 2018	Nov. 14, 2017	Aug. 11, 2017	May 12, 2017	Feb. 28, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)		$ 0.75	$ 0.725	$ 0.715	$ 0.705
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)		$ 3.00	$ 2.90	$ 2.86	$ 2.82
Total Cash Distribution, including general partner interest and IDRs		$ 23,997	$ 22,777	$ 22,270	$ 21,783	$ 21,000	$ 20,500
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)								$ 0.770	$ 0.705	$ 1.52	$ 1.3950
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Total Cash Distribution, including general partner interest and IDRs	$ 24,984
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)	$ 0.770
Distribution Made To Limited Partner Distributions Declared Annualized Per Unit	$ 3.08

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

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