Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Assets - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property, plant, and equipment
Gross property, plant and equipment	$ 238,799		$ 238,799		$ 215,090
Less: accumulated depreciation and amortization	156,591		156,591		149,819
Net property, plant, and equipment	82,208		82,208		65,271
Depreciation expense	3,500	$ 3,800	6,900	$ 7,700
Land
Property, plant, and equipment
Gross property, plant and equipment	5,061		5,061		5,061
Building and improvements
Property, plant, and equipment
Gross property, plant and equipment	63,117		63,117		62,865
Machinery and equipment
Property, plant, and equipment
Gross property, plant and equipment	144,585		144,585		140,493
Leaseholds improvements
Property, plant, and equipment
Gross property, plant and equipment	$ 26,036		$ 26,036		$ 6,671