CONSOLIDATED AND CONDENSED STATEMENTS OF CAPITAL (DEFICIT) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Partners' Capital
Beginning balance			$ (36,196)	$ 288,432
Net Income (Loss)	$ (2,203)	$ (191,182)	6,612	(194,838)
Issuance of common units, net				(259)
Issuance of restricted units			0	0
Forfeiture of restricted units			0	0
Cash distributions			(4,923)	(29,440)
Unit-based compensation			709	715
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	(33,807)	(37,114)	(33,807)	(37,114)
Common Limited
Increase (Decrease) in Partners' Capital
Beginning balance			$ (38,342)	$ 258,085
Beginning balance (in shares)			38,863,389	39,032,237
Net Income (Loss)			$ 6,480	$ (190,941)
Issuance of common units, net				$ (259)
Issuance of restricted units (in shares)			81,000	16,944
Forfeiture of restricted units (in shares)			(84,134)	(154,288)
Cash distributions			$ (4,825)	$ (28,851)
Unit-based compensation			709	715
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	$ (35,987)	$ (39,255)	$ (35,987)	$ (39,255)
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 Income (Loss)			132	(3,897)
Cash distributions			(98)	(589)
Ending balance	$ 2,180	$ 2,141	2,180	2,141
Parent Net Investment
Increase (Decrease) in Partners' Capital
Beginning balance			0	23,720
Contribution to parent				(23,720)
Ending balance	$ 0	$ 0	$ 0	$ 0