Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax computed at federal statutory rate	$ (8,830)	$ 25,168
State income tax, net of federal benefit	(451)	1,940
Permanent items	510	624
Transaction costs	21	517
Global intangible low taxed income	538	0
Foreign rate differential	350	(773)
Gain on tax receivable agreement	(250)	(23,812)
Rate change	47	(9,100)
Valuation allowance	(471)	864
Other	2,908	(1,393)
Income tax benefit	$ (5,628)	$ (5,965)