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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property and Equipment

Schedule of property and equipment

		December 31,
		2018			2017			Useful Lives
Land, building and other		$	15,164		$	16,610			3 to 40 years
Recording equipment			171,514			183,841			5 to 10 years
Line clearing equipment			—			11			5 years
Vibrator energy sources			79,168			79,694			5 to 15 years
Vehicles			28,101			27,688			1.5 to 10 years
			293,948			307,844
Less accumulated depreciation			(222,407)			(221,271)
Property and equipment, net		$	71,541		$	86,573

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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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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