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Equity - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands									1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 23, 2018	Aug. 13, 2018	May 15, 2018	May 07, 2018	Feb. 12, 2018	Nov. 14, 2017	Aug. 11, 2017	May 12, 2017	Feb. 28, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)		$ 0.770	$ 0.750		$ 0.725	$ 0.715
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)		$ 3.08	$ 3.00		$ 2.90	$ 2.86
Total Cash Distribution, including general partner interest and IDRs		$ 24,984	$ 23,997	$ 24,000	$ 22,777	$ 22,270	$ 21,800	$ 21,000	$ 20,500
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)										$ 0.790	$ 0.715	$ 2.310	$ 2.110
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Total Cash Distribution, including general partner interest and IDRs	$ 25,960
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)	$ 0.790
Distribution Made To Limited Partner Distributions Declared Annualized Per Unit	$ 3.16

X

- Definition

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

+ References

No definition available.

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

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

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