Plant, Equipment, Leasehold Improvements and Operating Lease Right-of-Use Assets (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 81,093		$ 80,577
Less accumulated depreciation an amortization	(47,121)		(44,801)
Operating lease right-of-use assets, net of accumulated amortization	5,956		6,312
Total property, equipment and leasehold improvements, net	39,928		42,088
Depreciation	3,029	$ 3,059
Machinery and equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	52,270		52,212
Machinery and equipment under financing leases
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	8,507		8,256
Furniture, fixtures and computer equipment
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	4,646		4,749
Leasehold improvements
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	14,914		14,905
Construction in progress
Plant, Equipment and Leasehold Improvements
Plant, equipment and leasehold improvements, gross	$ 756		$ 455

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

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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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