Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 137,702	$ 129,874
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	2,974	2,974
Buildings
Property, Plant and Equipment [Line Items]
Total property and equipment	87,886	85,776
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	6,096	6,058
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	40,746	35,066
Airplane
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 0	$ 0