Seismic Data Library (Tables)

12 Months Ended

Dec. 31, 2017

Seismic Data Library [Abstract]

Summary of the net book value of the Company’s seismic data library

The following table sets forth a summary of the net book value of the Company’s seismic data library (in thousands):

	As of December 31,
	2017		2016
U.S. Onshore:
Unconventional 3D	$	57,697	$	96,457
Conventional 3D	3,234		2,103
Canada:
Unconventional 3D	12,215		16,361
Conventional 3D	86		154
2D	291		415
U.S. Offshore	165		168
Mexico 2D	854		264
Total	$	74,542	$	115,922