Partners' Capital, Mezzanine Equity and Distributions (Preferred Cash Distributions Paid) (Details) - Preferred Unitholders - Class A Convertible Preferred Units - USD ($) $ / shares in Units, $ in Thousands	Feb. 14, 2022	Nov. 12, 2021	Aug. 13, 2021	May 14, 2021	Feb. 12, 2021	Nov. 13, 2020	Aug. 14, 2020	May 15, 2020	Feb. 14, 2020	Nov. 14, 2019	Aug. 14, 2019	May 15, 2019
Temporary Equity [Line Items]
Date Paid		Nov. 12, 2021	Aug. 13, 2021	May 14, 2021	Feb. 12, 2021	Nov. 13, 2020	Aug. 14, 2020	May 15, 2020	Feb. 14, 2020	Nov. 14, 2019	Aug. 14, 2019	May 15, 2019
Per Unit Amount (in dollars per unit)		$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.7374	$ 0.2458
Total Amount		$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 18,684	$ 6,138
Subsequent Event | Scenario, Forecast
Temporary Equity [Line Items]
Date Paid	Feb. 14, 2022
Per Unit Amount (in dollars per unit)	$ 0.7374
Total Amount	$ 18,684