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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The cash inflow from the sale of land held for use; excludes sales of land held as inventory or investments.

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property, Plant, and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, plant, and equipment
Gross property, plant and equipment	$ 211,340	$ 204,211
Less: accumulated depreciation and amortization	135,629	123,927
Net property, plant, and equipment	75,711	80,284	$ 85,058
Depreciation expense	17,300	17,600	$ 14,600
Proceeds from sale of land	600
Land
Property, plant, and equipment
Gross property, plant and equipment	5,061	5,669
Building and improvements
Property, plant, and equipment
Gross property, plant and equipment	$ 61,884	61,124
Building and improvements \| Minimum
Property, plant, and equipment
Average Useful Life	10 years
Building and improvements \| Maximum
Property, plant, and equipment
Average Useful Life	40 years
Machinery and equipment
Property, plant, and equipment
Gross property, plant and equipment	$ 137,692	128,385
Machinery and equipment \| Minimum
Property, plant, and equipment
Average Useful Life	3 years
Machinery and equipment \| Maximum
Property, plant, and equipment
Average Useful Life	10 years
Leaseholds improvements
Property, plant, and equipment
Gross property, plant and equipment	$ 6,703	$ 9,033
Leaseholds improvements \| Minimum
Property, plant, and equipment
Average Useful Life	3 years
Leaseholds improvements \| Maximum
Property, plant, and equipment
Average Useful Life	7 years