Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
GOODWILL	$ 179,044	$ 179,044	$ 178,159
Goodwill, Acquired During Period	0	885
Reservoir Description Segment [Member]
Goodwill [Line Items]
GOODWILL	99,484	99,484	98,599
Goodwill, Acquired During Period	0	885
Production Enhancement Segment [Member]
Goodwill [Line Items]
GOODWILL	79,560	79,560	$ 79,560
Goodwill, Acquired During Period	$ 0	$ 0