Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of income tax expense from operations to the federal statutory rate
Income taxes computed at federal statutory rate	$ (19,051)	$ 20,238	$ 134,961
State income taxes - net of federal benefit	(4,728)	4,313	13,570
Federal alternative minimum tax and state and local taxes on pass-through entities	937	1,076	1,072
Income taxes computed at the effective federal and state statutory rate for pass-through entities not subject to tax for the company	(22,089)	(41,367)	(84,747)
Tax benefit from of transfer assets	(14,170)
Increase in valuation allowance due to transfer of assets	26,350
Increase in valuation allowance	59,552	43,175	11,194
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	26,400
Impact of 2017 Tax Act			78,222
Impact of other state tax rate changes	1,653	(2,020)
Goodwill impairment		6,158
Transfer of assets	12,200
Other	1,128	(783)	638
Income tax expense	29,582	30,790	154,910
Tax Receivable Agreement liability adjustment	$ (2,500)	$ 300	$ (38,800)