Partners' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended
	Mar. 29, 2019	Oct. 04, 2018	Aug. 04, 2014	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Partners Units, Maximum Aggregate Offering Amount, ATM		$ 50
Net proceeds from private placement of common units	$ 62,934			$ (255)	$ (18)	$ 62,934	$ 0	$ 62,661
Limited Partner [Member]
Class of Stock [Line Items]
Number of units sold in public offering	2,940,818		12,937,500
Units sold in secondary offering price per unit (in dollars per share)	$ 21.40
Affiliated Entity [Member]
Class of Stock [Line Items]
Partners' Capital Account, Units, Sold to Related Party	1,401,869