Property and Equipment, Net - Property and Equipment Table (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 516,700	$ 496,020
Less: Accumulated depreciation	262,370	242,960
Property and equipment, net	254,330	253,060
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19,730	20,040
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	92,520	91,970
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 404,450	$ 384,010