Immaterial Corrections to Prior Period Financial Statements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Immaterial Corrections to Prior Period Financial Statements
Franchise agreements, net	$ 69,802	$ 84,691
Goodwill	165,358	148,561	$ 140,207
Deferred tax assets, net	50,702	54,501
Total assets	546,368	530,802
Retained earnings	25,628	30,732
Non-controlling interest	(416,007)	(411,267)
Total stockholders' equity	101,657	86,826	$ 63,006	$ 32,920
Purchase Accounting
Immaterial Corrections to Prior Period Financial Statements
Franchise agreements, net	69,802	84,691
Goodwill	165,358	148,561
Deferred tax assets, net	50,702	54,501
Total assets	546,368	530,802
Retained earnings	25,628	30,732
Non-controlling interest	(416,007)	(411,267)
Total stockholders' equity	101,657	86,826
Previously Reported | Purchase Accounting
Immaterial Corrections to Prior Period Financial Statements
Franchise agreements, net	72,196	87,670
Goodwill	175,835	159,038
Deferred tax assets, net	48,855	52,595
Total assets	557,392	542,352
Retained earnings	25,139	30,525
Non-controlling interest	(404,494)	(399,510)
Total stockholders' equity	$ 112,681	$ 98,376