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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Gross	$ 253,066	$ 271,480
Less accumulated depreciation	(226,717)	(232,580)
Property and equipment, net	26,349	38,900
Land, building and other
Property, Plant and Equipment
Gross	$ 15,156	$ 16,070
Land, building and other | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	3 years	3 years
Land, building and other | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	40 years	40 years
Recording equipment
Property, Plant and Equipment
Gross	$ 148,330	$ 158,619
Recording equipment | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	5 years	5 years
Recording equipment | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	10 years	10 years
Vibrator energy sources
Property, Plant and Equipment
Gross	$ 69,239	$ 73,852
Vibrator energy sources | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	5 years	5 years
Vibrator energy sources | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	15 years	15 years
Vehicles
Property, Plant and Equipment
Gross	$ 20,341	$ 22,939
Vehicles | Minimum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	1 year 6 months	1 year 6 months
Vehicles | Maximum
Property, Plant and Equipment
Estimated useful lives of property and equipment (in years)	10 years	10 years

X

- Definition

Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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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