Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary of Property, Plant, Equipment and Seismic Rental Equipment

Property, plant, equipment and seismic rental equipment are stated at cost. Depreciation expense is provided straight-line over the following estimated useful lives:

	Years
Machinery and equipment	3-7
Buildings	5-25
Seismic rental equipment	3-5
Leased equipment and other	3-10

A summary of property, plant, equipment and seismic rental equipment follows (in thousands):

	December 31,
	2016			2015
Buildings	$	17,424		$	24,181
Machinery and equipment (a)	157,618			152,358
Seismic rental equipment	1,557			1,904
Furniture and fixtures	3,905			4,334
Other	30,049			31,821
Total	210,553			214,598
Less accumulated depreciation	(143,065		)	(142,571		)
Property, plant, equipment and seismic rental equipment, net	$	67,488		$	72,027

Schedule of Multi-Client Data Library

At December 31, 2016 and 2015, multi-client data library costs and accumulated amortization consisted of the following (in thousands):

	December 31,
	2016			2015
Gross costs of multi-client data creation	$	906,306		$	899,273
Less accumulated amortization	(680,770		)	(647,435		)
Less impairments to multi-client data library	(119,601		)	(119,601		)
Total	$	105,935		$	132,237