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Equity - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands								1 Months Ended	3 Months Ended
	May 14, 2019	Feb. 12, 2019	Nov. 09, 2018	Oct. 23, 2018	Aug. 13, 2018	May 15, 2018	Feb. 12, 2018	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)		$ 0.810		$ 0.790	$ 0.770	$ 0.750
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)		$ 3.24		$ 3.16	$ 3.08	$ 3.00
Total Cash Distribution, including general partner interest and IDRs		$ 26,949	$ 25,960		$ 24,984	$ 23,997	$ 22,800	$ 26,900
Total Quarterly Distribution Per Limited Partner Unit - Declared (in dollars per share)									$ 0.820	$ 0.750
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit - Paid (in dollars per share)	$ 0.820
Total Quarterly Distribution Per Limited Partner Unit, Annualized - Paid (in dollars per share)	$ 3.28
Total Cash Distribution, including general partner interest and IDRs	$ 27,438

X

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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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