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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property and Equipment  
Schedule of property and equipment, together with the related estimated useful lives

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31,

 

 

 

 

 

    

2016

    

2015

 

Useful Lives

 

Land, building and other

 

$
15,777,000

 

$
16,357,000

 

 

3 to 40 years

 

Recording equipment

 

 
199,068,000

 

 
212,541,000

 

 

5 to 10 years

 

Line clearing equipment

 

 
1,071,000

 

 
1,071,000

 

 

5 years

 

Vibrator energy sources

 

 
79,162,000

 

 
80,454,000

 

 

5 to 15 years

 

Vehicles

 

 
29,872,000

 

 
35,196,000

 

 

1.5 to 10 years

 

 

 

 
324,950,000

 

 
345,619,000

 

 

 

 

Less accumulated depreciation

 

 
(214,033,000)

 

 
(198,052,000)

 

 

 

 

Net property and equipment

 

$
110,917,000

 

$
147,567,000