Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
GOODWILL	$ 162,787	$ 154,217	$ 148,600
Goodwill, Acquired During Period	8,570	5,617
Reservoir Description Segment [Member]
Goodwill [Line Items]
GOODWILL	80,932	80,932	80,932
Goodwill, Acquired During Period	0	0
Production Enhancement Segment [Member]
Goodwill [Line Items]
GOODWILL	79,010	70,440	64,823
Goodwill, Acquired During Period	8,570	5,617
Reservoir Management Segment [Member]
Goodwill [Line Items]
GOODWILL	2,845	2,845	2,845
Goodwill, Acquired During Period	$ 0	$ 0