Basis of Presentation and Significant Accounting Policies - Activity related to non-monetary exchanges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Non-monetary Transaction
Additions to seismic data library	$ 2,640	$ 9,311	$ 950
Non-cash revenue	3,308	6,928	1,071
Seismic Data Library [Member]
Non-monetary Transaction
Additions to seismic data library	2,640	9,311	950
Specific data licenses or selections of data [Member]
Non-monetary Transaction
Non-cash revenue	3,179	6,747	1,033
Acquisition contracts [Member]
Non-monetary Transaction
Non-cash revenue	129	168	38
Solutions [Member]
Non-monetary Transaction
Non-cash revenue	$ 0	$ 13	$ 0