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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property and Equipment

Schedule of property and equipment

		December 31,
		2017			2016			Useful Lives
Land, building and other		$	16,610		$	15,777			3 to 40 years
Recording equipment			183,841			199,068			5 to 10 years
Line clearing equipment			11			1,071			5 years
Vibrator energy sources			79,694			79,162			5 to 15 years
Vehicles			27,688			29,872			1.5 to 10 years
			307,844			324,950
Less accumulated depreciation			(221,271)			(214,033)
Property and equipment, net		$	86,573		$	110,917

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- References

No definition available.

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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