CONSOLIDATED AND CONDENSED STATEMENTS OF CAPITAL (DEFICIT) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Partners' Capital
Beginning balance			$ (36,196)	$ 288,432
Net loss	$ (10,819)	$ 13,250	(4,207)	(181,588)
Issuance of common units, net				(289)
Issuance of restricted units			0	0
Forfeiture of restricted units			0	0
Cash distributions			(5,121)	(39,265)
Unit-based compensation			1,070	1,064
Purchase of treasury units			(9)	(392)
Excess purchase price over carrying value of acquired assets				(102,393)
Deferred taxes on acquired assets and liabilities				24,781
Contribution to parent				(23,720)
Ending balance	(44,463)	(33,370)	(44,463)	(33,370)
Common Limited
Increase (Decrease) in Partners' Capital
Beginning balance			$ (38,342)	$ 258,085
Beginning balance (in shares)			38,863,389	39,032,237
Net loss			$ (4,123)	$ (177,956)
Issuance of common units, net				$ (289)
Issuance of restricted units (in shares)			81,000	16,944
Forfeiture of restricted units (in shares)			(84,134)	(154,288)
Cash distributions			$ (5,019)	$ (38,480)
Unit-based compensation			1,070	1,064
Purchase of treasury units			$ (9)	$ (392)
Purchase of treasury units (in shares)			(7,748)	(31,504)
Excess purchase price over carrying value of acquired assets				$ (102,393)
Deferred taxes on acquired assets and liabilities				24,781
Ending balance	$ (46,423)	$ (35,580)	$ (46,423)	$ (35,580)
Ending balance (in shares)	38,852,507	38,863,389	38,852,507	38,863,389
General Partner Amount
Increase (Decrease) in Partners' Capital
Beginning balance			$ 2,146	$ 6,627
Net loss			(84)	(3,632)
Cash distributions			(102)	(785)
Ending balance	$ 1,960	$ 2,210	1,960	2,210
Parent Net Investment
Increase (Decrease) in Partners' Capital
Beginning balance			0	23,720
Contribution to parent				(23,720)
Ending balance	$ 0	$ 0	$ 0	$ 0