Partners' Capital, Mezzanine Equity and Distributions (Paid in Kind Distributions Paid) (Details) - Class A Convertible Preferred Units - USD ($) $ in Thousands								12 Months Ended
	May 15, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Nov. 14, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Distribution Made to Limited Partner [Line Items]
Date Issued	May 15, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Nov. 14, 2018
Number of Units (in units)	364,180	534,576	523,132	511,934	500,967	490,252	162,234	898,756	2,026,294	162,234
Total Amount	$ 12,277	$ 18,021	$ 17,635	$ 17,257	$ 16,888	$ 16,526	$ 5,469	$ 30,298	$ 68,306	$ 5,469