CONSOLIDATED STATEMENTS OF CHANGES IN OWNERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital in Excess of Par Value	Outstanding Common Units	Members' Equity	Redeemable Convertible Preferred Units Series A
Beginning Balance at Dec. 31, 2017	$ 91,696				$ 91,696
Cumulative effect of accounting change	(28,097)				(28,097)
Balance, Adjusted at Dec. 31, 2017	63,599				63,599
Balance, Adjusted (in units) at Dec. 31, 2017				37,957,936
Common unit awards under incentive plans/Unit-based compensation	2,522				2,522
Common unit awards under incentive plans/Unit-based compensation (in units)				709
Net loss	(72,699)				(72,699)
Ending Balance (in units) at Dec. 31, 2018				37,958,645
Ending Balance at Dec. 31, 2018	(10,618)
Beginning Balance at Dec. 31, 2018	(10,618)
Cumulative effect of accounting change	(4,040)				(4,040)
Balance, Adjusted at Dec. 31, 2018	(10,618)				(10,618)
Issuance of Series A Preferred Units	12,500					$ 12,500
Issuance of Series A Preferred Units (in units)						11,322,465
Issuance of Series A Preferred Units - related party	45,000					$ 45,000
Issuance of Series A Preferred Units - related party (in units)						40,760,868
Rights offering - related party						$ (3,647)
Rights offering - related party (in units)						(3,039,380)
Rights offering - related party					3,647
Rights offering - related party (in units)				3,039,380
GP Holdings' Merger consideration			$ (4,032)		4,032
GP Holdings' Merger consideration (in units)				2,950,000
Reduction to GP Holdings' Merger consideration related to SEC settlement - related party	(250)				(250)
Reduction to GP Holdings' Merger consideration related to SEC settlement - related party (in units)				(182,909)
Common unit awards under incentive plans/Unit-based compensation	3,623				3,623
Common unit awards under incentive plans/Unit-based compensation (in units)				2,067,088
Units repurchased related to unit-based compensation	(803)				(803)
Units repurchased related to unit-based compensation (in units)				(428,802)
Net loss	(151,942)				(151,942)
Effect of the C-Corporation Conversion on owners' equity		$ 944,474	(1,042,932)		$ 152,311	$ (53,853)
Effect of the C-Corporation Conversion on owners' equity (in units		94,447,356		(45,403,402)		(49,043,953)
Ending Balance at Dec. 31, 2019	$ (102,490)	$ 944,474	$ (1,046,964)
Ending Balance (in shares) at Dec. 31, 2019		94,447,356