Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands		Preferred units		Common Units [Member] Common Class A Units [Member]	Common Units [Member] Common Class P Units [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income								$ 24,989	$ 24,989
Balances as of at Dec. 31, 2018		$ 684,979		$ 1			$ 767	(637)	685,110
Balance as of (in units) at Dec. 31, 2018				20,950	50
Balance as of (in units) at Dec. 31, 2018	[1]	6,827,701
Increase (Decrease) In Members Equity [RollForward]
Contributions		$ 79,535		$ 200					79,735
Contributions (in units)		796,028	[1]	850
Reinvestments		$ 7,094							7,094
Reinvestments (in units)	[1]	71,086
Net Income								24,989	24,989
Distributions								(24,134)	(24,134)
Redemptions		$ (13,331)							(13,331)
Redemptions (in units)	[1]	(133,513)
Compensation expense related to grant of profits interest							734		734
Compensation expense related to grants of restricted stock units.				(100)	100
Grants of restricted units							134		134
Grants of restricted units (in unit)				150
Balance as of at Mar. 31, 2019		$ 758,277		$ 201			1,635	218	$ 760,331
Balance as of (in units) at Mar. 31, 2019				21,850	150
Balance as of (in units) at Mar. 31, 2019	[1]	7,561,302
Financial Designation	[2]								Predecessor
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	[2]								$ 82,045
Balances as of at Dec. 31, 2018		$ 684,979		$ 1			767	(637)	685,110
Balance as of (in units) at Dec. 31, 2018				20,950	50
Balance as of (in units) at Dec. 31, 2018	[1]	6,827,701
Increase (Decrease) In Members Equity [RollForward]
Net Income	[2]								82,045
Balance as of at Sep. 30, 2019		$ 1,010,625		$ 201			1,975	(1,208)	1,011,593
Balance as of (in units) at Sep. 30, 2019				21,850	150
Balance as of (in units) at Sep. 30, 2019	[1]	9,356,572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income								31,200	31,200
Balances as of at Mar. 31, 2019		$ 758,277		$ 201			1,635	218	760,331
Balance as of (in units) at Mar. 31, 2019				21,850	150
Balance as of (in units) at Mar. 31, 2019	[1]	7,561,302
Increase (Decrease) In Members Equity [RollForward]
Contributions		$ 122,414							122,414
Contributions (in units)	[1]	1,441,711
Reinvestments		$ 8,594							8,594
Reinvestments (in units)	[1]	86,222
Net Income								31,200	31,200
Distributions								(29,125)	(29,125)
Redemptions		$ (22,927)							(22,927)
Redemptions (in units)	[1]	(227,248)
Grants of restricted units							170		170
Balance as of at Jun. 30, 2019		$ 866,358		$ 201			1,805	2,293	$ 870,657
Balance as of (in units) at Jun. 30, 2019				21,850	150
Balance as of (in units) at Jun. 30, 2019	[1]	8,861,987
Financial Designation	[2]								Predecessor
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income								25,856	$ 25,856	[2]
Increase (Decrease) In Members Equity [RollForward]
Contributions		$ 154,437							154,437
Contributions (in units)	[1]	567,905
Reinvestments		$ 9,340							9,340
Reinvestments (in units)	[1]	43,293
Net Income								25,856	25,856	[2]
Distributions								(29,357)	(29,357)
Redemptions		$ (19,510)							(19,510)
Redemptions (in units)	[1]	(116,613)
Grants of restricted units							170		170
Balance as of at Sep. 30, 2019		$ 1,010,625		$ 201			1,975	(1,208)	1,011,593
Balance as of (in units) at Sep. 30, 2019				21,850	150
Balance as of (in units) at Sep. 30, 2019	[1]	9,356,572
Balance at Dec. 31, 2019						$ 132	1,209,120	(24,780)	1,184,472
Balance, Shares at Dec. 31, 2019						132,015,635
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares from vested RSUs (in shares)						95,694
Net Income								27,279	27,279
Dividends								(31,700)	(31,700)
Stock-based compensation expense							914		914
Balance at Mar. 31, 2020						$ 132	1,210,034	(29,201)	1,180,965
Balance, Shares at Mar. 31, 2020						132,111,329
Increase (Decrease) In Members Equity [RollForward]
Net Income								27,279	$ 27,279
Financial Designation									Successor
Balance at Dec. 31, 2019						$ 132	1,209,120	(24,780)	$ 1,184,472
Balance, Shares at Dec. 31, 2019						132,015,635
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income									70,262
Balance at Sep. 30, 2020						$ 132	1,212,914	(33,857)	1,179,189
Balance, Shares at Sep. 30, 2020						132,236,307
Increase (Decrease) In Members Equity [RollForward]
Net Income									70,262
Balance at Mar. 31, 2020						$ 132	1,210,034	(29,201)	1,180,965
Balance, Shares at Mar. 31, 2020						132,111,329
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares from vested RSUs (in shares)						119,855
Net Income								19,759	19,759
Dividends								(23,793)	(23,793)
Stock-based compensation expense							967		967
Balance at Jun. 30, 2020						$ 132	1,211,001	(33,235)	1,177,898
Balance, Shares at Jun. 30, 2020						132,231,184
Increase (Decrease) In Members Equity [RollForward]
Net Income								19,759	$ 19,759
Financial Designation									Successor
Issuance of shares from vested RSUs (in shares)						5,098
Issuance of shares from exercised warrants						25
Net Income								23,224	$ 23,224
Dividends								(23,846)	(23,846)
Stock-based compensation expense							1,913		1,913
Balance at Sep. 30, 2020						$ 132	$ 1,212,914	(33,857)	1,179,189
Balance, Shares at Sep. 30, 2020						132,236,307
Increase (Decrease) In Members Equity [RollForward]
Net Income								$ 23,224	$ 23,224

[1] The Company determined that earnings per unit in the Predecessor periods would not be meaningful to the users of this filing, given the different unit holders and members’ equity structures of each individual entity in the Predecessor Company Group.

[2] Predecessor periods are combined as disclosed in Note 1.