Equity - Class C Preferred Units (Details) - USD ($) $ / shares in Units, $ in Thousands									3 Months Ended	15 Months Ended
	Jan. 15, 2021	Oct. 15, 2020	Jul. 15, 2020	Apr. 15, 2020	Jan. 15, 2020	Oct. 15, 2019	Jul. 15, 2019	Apr. 02, 2019	Mar. 31, 2022	Mar. 31, 2022
Class C Perpetual Preferred Units
Preferred Units
Preferred units dividend rate								9.625%
Preferred unit par or stated value per share								$ 25.00
Units issued, net of offering costs (Note 9)								$ 42,900
Preferred units, underwriting discounts and commissions								1,400
Preferred units, offering costs								$ 700
Preferred units, redemption terms								At any time on or after April 15, 2024, we may redeem our Class C Preferred Units, in whole or in part, at a redemption price of $25.00 per Class C Preferred Unit plus an amount equal to all accumulated and unpaid distributions to, but not including, the date of redemption, whether or not declared. We may also redeem the Class C Preferred Units upon a change of control as defined in our partnership agreement. If we choose not to redeem the Class C Preferred Units, the Class C preferred unitholders may have the ability to convert the Class C Preferred Units to common units at the then applicable conversion rate. Class C preferred unitholders have no voting rights except with respect to certain matters set forth in our partnership agreement.
Preferred units, dividend payment terms								Distributions on the Class C Preferred Units are payable on the 15th day of each January, April, July and October of each year to holders of record on the first day of each payment month. On and after April 15, 2024, distributions on the Class C Preferred Units will accumulate at a percentage of the $25.00 liquidation preference equal to the applicable three-month LIBOR interest rate (or alternative rate as determined in accordance with the partnership agreement) plus a spread of 7.384%.
Distributions made to preferred unitholders distributions declared per unit	$ 0.6016	$ 0.6016	$ 0.6016	$ 0.6016	$ 0.6016	$ 0.6016	$ 0.5949
Amount paid to preferred unitholders	$ 1,083	$ 1,083	$ 1,083	$ 1,083	$ 1,083	$ 1,083	$ 1,071
Class C Perpetual Preferred Units
Preferred Units
Preferred units, dividend payment terms								The current distribution rate for the Class C Preferred Units is 9.625% per year of the $25.00 liquidation preference per unit (equal to $2.41 per unit per year).
Class C Perpetual Preferred Units
Preferred Units
Distributions earned during the quarter but not paid									$ 0.6016
Class C Perpetual Preferred Units | Cumulative distributions
Preferred Units
Distributions earned but not declared										$ 3.0078
Cumulative distributions earned but not paid on including accumulated interest										$ 5,700
Class C Perpetual Preferred Units | Class C Perpetual Preferred Units
Preferred Units
Units issued (in units)								1,800,000