Amount of lessee's right to use underlying asset under operating lease net of amortization.

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- Definition

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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Plant, Equipment, Leasehold Improvements and Operating Lease Right-of-Use Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 106,674		$ 106,674		$ 97,119
Less accumulated depreciation and amortization	(66,354)		(66,354)		(61,937)
Operating lease right-of-use assets, net of accumulated amortization	11,883		11,883		12,069
Total property, equipment and leasehold improvements, net	52,203		52,203		47,251
Depreciation	2,604	$ 2,668	5,248	$ 5,741
Machinery and equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	68,631		68,631		64,051
Machinery and equipment under financing leases
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	12,166		12,166		9,088
Furniture, fixtures and computer equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	5,273		5,273		4,570
Leasehold improvements
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	14,651		14,651		14,142
Construction in progress
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 5,953		$ 5,953		$ 5,268