Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 121,455	$ 114,265
Less accumulated depreciation	(61,491)	(57,992)
Property and equipment, less accumulated depreciation	59,964	56,273
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,828	3,828
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	24,261	24,197
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	473	482
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,584	15,536
Revenue-generating assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61,527	56,336
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,751	13,855
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 31	$ 31