Partners' Capital - Net Income Per Unit (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Reconciliation of Net Income from Continuing and Discontinuing Operations [Line Items]
Income (loss) from continuing operations	$ 8,815	$ (4,758)
Income from discontinued operations	0	1,102
Less general partner’s interest in net income (loss):
Less income (loss) allocable to unvested restricted units	55	(2)
Limited partners’ interest in net income (loss)	$ 8,584	$ (3,581)
Basic weighted average limited partner units outstanding (in shares)	38,640,862	38,681,925
Dilutive effect of restricted units issued (in shares)	3,605	0
Total weighted average limited partner diluted units outstanding (in shares)	38,644,467	38,681,925
Continuing operations
Less general partner’s interest in net income (loss):
Distributions payable on behalf of general partner interest	$ (49)	$ (256)
General partner interest in undistributed income (loss)	127	(351)
Less income (loss) allocable to unvested restricted units	55	(3)
Limited partners’ interest in net income (loss)	8,584	(4,660)
Discontinued operations
Less general partner’s interest in net income (loss):
Distributions payable on behalf of general partner interest	0	(59)
General partner interest in undistributed income (loss)	0	81
Less income (loss) allocable to unvested restricted units	0	1
Limited partners’ interest in net income (loss)	$ 0	$ 1,079