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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment
Gross	$ 293,948	$ 307,844
Less accumulated depreciation	(222,407)	(221,271)
Property and equipment, net	71,541	86,573
Land, building and other
Property, Plant and Equipment
Gross	$ 15,164	$ 16,610
Land, building and other | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment	3 years	3 years
Land, building and other | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment	40 years	40 years
Recording equipment
Property, Plant and Equipment
Gross	$ 171,514	$ 183,841
Recording equipment | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment	5 years	5 years
Recording equipment | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment	10 years	10 years
Line clearing equipment
Property, Plant and Equipment
Gross		$ 11
Estimated useful lives of property and equipment		5 years
Vibrator energy sources
Property, Plant and Equipment
Gross	$ 79,168	$ 79,694
Vibrator energy sources | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment	5 years	5 years
Vibrator energy sources | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment	15 years	15 years
Vehicles
Property, Plant and Equipment
Gross	$ 28,101	$ 27,688
Vehicles | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment	1 year 6 months	1 year 6 months
Vehicles | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment	10 years	10 years

X

- Definition

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

+ 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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+ References

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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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