Condensed Consolidated Statements of Changes in Member's Equity (unaudited) shares in Thousands, $ in Thousands	USD ($) shares
Beginning balance (in shares) at Dec. 31, 2018 | shares	1	[1]
Beginning balance at Dec. 31, 2018	$ 264,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contribution	133
Net income (loss)	$ 12,965
Ending balance (in shares) at Sep. 30, 2019 | shares	1	[1]
Ending balance at Sep. 30, 2019	$ 277,572
Beginning balance (in shares) at Jun. 30, 2019 | shares	1	[1]
Beginning balance at Jun. 30, 2019	$ 259,381
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 18,191
Ending balance (in shares) at Sep. 30, 2019 | shares	1	[1]
Ending balance at Sep. 30, 2019	$ 277,572
Beginning balance (in shares) at Dec. 31, 2019 | shares	1	[1]
Beginning balance at Dec. 31, 2019	$ 305,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation	3,264
Net income (loss)	$ 68,845
Ending balance (in shares) at Sep. 30, 2020 | shares	1	[1]
Ending balance at Sep. 30, 2020	$ 377,260
Beginning balance (in shares) at Jun. 30, 2020 | shares	1	[1]
Beginning balance at Jun. 30, 2020	$ 383,639
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity based compensation	853
Net income (loss)	$ (7,232)
Ending balance (in shares) at Sep. 30, 2020 | shares	1	[1]
Ending balance at Sep. 30, 2020	$ 377,260

[1] See Note 2 - Summary of Significant Accounting Policies - Corporate Conversion and Stock Split