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Partners' Capital, Mezzanine Equity and Distributions (Distributions Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands		Feb. 14, 2020	Nov. 14, 2019	Aug. 14, 2019	May 15, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Feb. 14, 2017
Distribution Made to Limited Partner [Line Items]
Per Unit Amount (in dollars per unit)	[1]										$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5400	$ 0.5300	$ 0.5200
Common Unitholders [Member]
Distribution Made to Limited Partner [Line Items]
Date Paid			Nov. 14, 2019	Aug. 14, 2019	May 15, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018
Per Unit Amount (in dollars per unit)			$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5500	$ 0.5400	$ 0.5300	$ 0.5200										$ 0.5100
Total Amount			$ 67,419	$ 67,419	$ 67,419	$ 67,419	$ 66,193	$ 64,967	$ 63,741	$ 62,515
Common Unitholders [Member] | Scenario, Forecast | Subsequent Event
Distribution Made to Limited Partner [Line Items]
Date Paid		Feb. 14, 2020
Per Unit Amount (in dollars per unit)		$ 0.5500
Total Amount		$ 67,419
[1] (1) Represents cash distributions declared and paid in the applicable period.

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

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Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format.

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