Details of Selected Balance Sheet Accounts - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	$ 184,970		$ 183,228
Less accumulated depreciation	(135,514)		(133,634)
Less impairment of long-lived assets	(36,553)		(36,553)
Property, plant and equipment, net	12,903		13,041
Depreciation expense including amortization under finance leases	2,400	$ 6,000
Buildings
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	15,714		15,707
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	133,257		132,135
Seismic rental equipment
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	1,572		1,423
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	3,867		3,859
Other
Property, Plant and Equipment [Line Items]
Property, plant, equipment and seismic rental equipment	$ 30,560		$ 30,104

Accumulated Impairment, Property, Plant, and Equipment

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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 aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

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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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No definition available.

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