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Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Property and Equipment    
Property and equipment, Gross $ 238,064 $ 241,955
Less accumulated depreciation (225,085) (225,447)
Property and equipment, net 12,979 16,508
Land    
Property and Equipment    
Property and equipment, Gross 501 501
Buildings and other    
Property and Equipment    
Property and equipment, Gross $ 10,064 $ 12,975
Buildings and other | Minimum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 3 years 3 years
Buildings and other | Maximum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 40 years 40 years
Recording equipment    
Property and Equipment    
Property and equipment, Gross $ 140,307 $ 140,156
Recording equipment | Minimum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 5 years 5 years
Recording equipment | Maximum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 10 years 10 years
Vibrator energy sources    
Property and Equipment    
Property and equipment, Gross $ 64,997 $ 64,690
Vibrator energy sources | Minimum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 5 years 5 years
Vibrator energy sources | Maximum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 15 years 15 years
Vehicles    
Property and Equipment    
Property and equipment, Gross $ 22,195 $ 23,633
Vehicles | Minimum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 1 year 6 months 1 year 6 months
Vehicles | Maximum    
Property and Equipment    
Estimated useful lives of property and equipment (in years) 10 years 10 years