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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, 2019	May 14, 2019	Feb. 12, 2019	Nov. 09, 2018	Aug. 13, 2018	May 15, 2018	May 31, 2019	Feb. 28, 2019	Feb. 28, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)		$ 0.820	$ 0.810	$ 0.790	$ 0.770
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)		$ 3.28	$ 3.24	$ 3.16	$ 3.08
Total Cash Distribution, including general partner interest and IDRs		$ 27,438	$ 26,949	$ 25,960	$ 24,984	$ 24,000	$ 27,400	$ 26,900	$ 22,800
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)										$ 0.850	$ 0.770	$ 1.670	$ 1.520
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)	$ 0.850
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)	$ 3.40
Total Cash Distribution, including general partner interest and IDRs	$ 28,914

X

- Definition

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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