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Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment

Schedule of property, plant and equipment, together with the related estimated useful lives

		December 31,			September 30,
		2015			2014			Useful Lives
Land, building and other		$	16,357,000		$	15,472,000		3 to 40 years
Recording equipment			212,541,000			206,517,000		5 to 10 years
Line clearing equipment			1,071,000			1,084,000		5 years
Vibrator energy sources			80,454,000			78,119,000		5 to 15 years
Vehicles			35,196,000			36,730,000		1.5 to 10 years
​	​	​	​	​	​	​	​	​
			345,619,000			337,922,000
Less accumulated depreciation			(198,052,000	)		(173,428,000	)
​	​	​	​	​	​	​	​	​
Net property, plant and equipment		$	147,567,000		$	164,494,000
​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​

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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 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://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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph b
-Article 5

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