CONSOLIDATED AND CONDENSED STATEMENTS OF CAPITAL (DEFICIT) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Partners' Capital
Beginning balance	$ (36,196)	$ 288,432
Net (loss) income	8,815	(3,656)
Issuance of restricted units	0	0
Forfeiture of restricted units	0	0
Cash distributions	(2,457)	(19,613)
Unit-based compensation	346	352
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	(29,501)	163,791
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) income	$ 8,639	$ (3,583)
Issuance of restricted units (in shares)	81,000	16,944
Forfeiture of restricted units (in shares)	(84,134)	(118,087)
Cash distributions	$ (2,408)	$ (19,221)
Unit-based compensation	346	352
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	$ (31,774)	$ 157,629
Ending balance (in shares)	38,852,507	38,899,590
General Partner
Increase (Decrease) in Partners' Capital
Beginning balance	$ 2,146	$ 6,627
Net (loss) income	176	(73)
Cash distributions	(49)	(392)
Ending balance	2,273	6,162
Parent Net Investment
Increase (Decrease) in Partners' Capital
Beginning balance	0	23,720
Contribution to parent		(23,720)
Ending balance	$ 0	$ 0