Income Taxes - Effective Income Tax Rate Reconciliation Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at U.S. statutory rate	$ 16,333	$ 13,562	$ (16,947)
State income taxes	3,375	2,049	(3,365)
Derecognition of tax assets from IRS examination	0	9,284	0
Equity-based compensation	852	168	0
Contingent consideration	5,553	134	49
Credits	(79)	(284)	0
Other nondeductible expenses	437	40	48
Effect of CARES Act	(6,608)	0	0
Foreign income benefit	(1,201)	(155)	0
Change in valuation allowance	0	(45)	253
Other	43	81	30
Total Income Tax Expense (Benefit)	$ 18,705	$ 24,834	$ (19,932)