Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Allocation of net income
Net income	$ 8,381	[1]	$ 18,779	[2]
Less: income attributable to preferred unitholders	(7,727)		(7,500)
Net income attributable to common unitholders and the general partner	654		11,279
Net income attributable to the general partner	(13)		(226)
Net income attributable to common unitholders	$ 641		$ 11,053
Basic Income (Loss) per Unit:
Weighted average common units (in shares)	12,292		12,261
Basic net income per common unit	$ 0.05		$ 0.90
Diluted net income per common unit
Dilutive effect of Preferred Units (in shares)	0		23,187
Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment, Effect of Unit Awards	116		0
Weighted average common units—diluted (in shares)	12,408		35,448
Undistributed Earnings, Diluted	$ (7,727)		$ 0
Net Income (Loss) Allocated to General Partners and Limited Partners, Diluted	(654)		(18,779)
Less: diluted net income attributable to the general partner	(13)		(376)
Diluted net income attributable to common unitholders	$ 641		$ 18,403
Diluted net income per common unit (in dollars per share)	$ 0.05		$ 0.52
Warrant Holders | Warrants at $22.81 Strike
Class of Warrant or Right, Warrants Issued	1,750		1,750
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 22.81		$ 22.81
Warrant Holders | Warrants at $34.00 Strike
Class of Warrant or Right, Warrants Issued	2,250		2,250
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 34.00		$ 34.00

[1] Net income includes $7.727 million of income attributable to preferred unitholders that accumulated during the period, of which $7.572 million is allocated to the common unitholders and $0.155 million is allocated to the general partner.

[2] Net income includes $7.5 million of income attributable to preferred unitholders that accumulated during the period, of which $7.35 million is allocated to the common unitholders and $0.15 million is allocated to the general partner.