Seismic Data Library (Tables)

12 Months Ended

Dec. 31, 2012

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,
	2012		2011
U.S. Onshore:
Unconventional 3D	$	94,553	$	43,106
Conventional 3D	8,628		21,166
Canadian:
Unconventional 3D	76,335		55,738
Conventional 3D	294		513
2D	126		171
U.S. Offshore	181		—
Total	$	180,117	$	120,694