CONDENSED CONSOLIDATED STATEMENTS OF PREFERRED UNITS AND PARTNERS EARNINGS (DEFICIT) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Beginning Balance	$ (93,112)	$ (102,490)			$ (102,490)
Beginning Balance			$ (28,835)	$ (6,578)		$ (6,578)
Issuance of Series A Preferred Stock/Units	8,800		57,500
Issuance of Common Stock	8,200
Common stock awards under incentive plans	317	375
Common unit awards under incentive plans			2,289	277
Net income (loss)	(3,914)	9,003	(34,398)	(22,534)	5,089	(56,932)
Ending Balance	$ (79,709)	(93,112)			(79,709)
Ending Balance			(3,444)	$ (28,835)		(3,444)
Redeemable Convertible Preferred Unit
Issuance of Series A Preferred Stock/Units			$ 57,500
Issuance of Series A Preferred Stock\units (in shares\units)			52,083,333
Ending Balance			$ 57,500			$ 57,500
Ending Balance (in units)			52,083,333			52,083,333
Outstanding Common Units
Beginning Balance (in units)			38,260,471	37,958,645		37,958,645
Common unit awards under incentive plans (in units)			1,273,376	301,826
Ending Balance (in units)			39,533,847	38,260,471		39,533,847
Common Limited Partners
Beginning Balance			$ (24,593)	$ (2,570)		$ (2,570)
Common unit awards under incentive plans			2,287	277
Net income (loss)			(34,041)	(22,300)
Ending Balance			(56,347)	(24,593)		(56,347)
General Partner
Beginning Balance			(4,242)	(4,008)		(4,008)
Common unit awards under incentive plans			2
Net income (loss)			(357)	(234)
Ending Balance			$ (4,597)	$ (4,242)		$ (4,597)
Series A Preferred Stock
Issuance of Series A Preferred Stock\units (in shares\units)	176
Exchange of Series A Preferred Stock for Common Stock (in shares)	(176)
Common Stock
Beginning Balance	$ 944	$ 944			$ 944
Beginning Balance (in shares)	94,477,102	94,447,356			94,447,356
Exchange of Series A Preferred Stock for Common Stock	$ 121
Exchange of Series A Preferred Stock for Common Stock (in shares)	12,054,795
Issuance of Common Stock	$ 112
Issuance of Common Stock (in shares)	11,232,877
Common stock awards under incentive plans (in shares)	29,746	29,746
Ending Balance	$ 1,177	$ 944			$ 1,177
Ending Balance (in shares)	117,794,520	94,477,102			117,794,520
Paid-in Capital in Excess of Par Value
Beginning Balance	$ (103,059)	$ (103,434)			$ (103,434)
Issuance of Series A Preferred Stock/Units	8,800
Exchange of Series A Preferred Stock for Common Stock	(121)
Issuance of Common Stock	8,088
Common stock awards under incentive plans	317	375
Ending Balance	(85,975)	(103,059)			(85,975)
Retained Earnings
Beginning Balance	9,003
Net income (loss)	(3,914)	9,003
Ending Balance	$ 5,089	$ 9,003			$ 5,089