Partners' Capital - Net Income Per Unit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Reconciliation of Net Income from Continuing and Discontinuing Operations
Income (loss) from continuing operations	$ (2,203)	$ (10,614)	$ 6,612	$ (15,372)
Income from discontinued operations	0	(180,568)	0	(179,466)
Less general partner’s interest in net income (loss):
Less income (loss) allocable to unvested restricted units	(10)	(65)	45	(67)
Net Income (Loss) Allocated to Limited Partners	$ (2,149)	$ (187,293)	$ 6,435	$ (190,874)
Basic weighted average limited partner units outstanding (in shares)	38,661,852	38,871,420	38,651,357	38,912,250
Dilutive effect of restricted units issued (in shares)	0	0	540	0
Total weighted average limited partner diluted units outstanding (in shares)	38,661,852	38,871,420	38,651,897	38,912,250
Continuing operations
Less general partner’s interest in net income (loss):
Distributions payable on behalf of general partner interest	$ 4	$ 11	$ 53	$ 31
General partner interest in undistributed income (loss)	(48)	(223)	79	(338)
Less income (loss) allocable to unvested restricted units	(10)	(4)	45	(5)
Net Income (Loss) Allocated to Limited Partners	(2,149)	(10,398)	6,435	(15,060)
Discontinued operations
Less general partner’s interest in net income (loss):
Distributions payable on behalf of general partner interest	0	185	0	362
General partner interest in undistributed income (loss)	0	(3,797)	0	(3,952)
Less income (loss) allocable to unvested restricted units	0	(61)	0	(62)
Net Income (Loss) Allocated to Limited Partners	$ 0	$ (176,895)	$ 0	$ (175,814)