Goodwill (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]

The changes in the carrying amount of goodwill for each reportable segment for the years ended December 31, 2012, 2011 and 2010 were as follows (in thousands):

	Reservoir Description		Production Enhancement		ReservoirManagement		Total
Balance at December 31, 2010	$	80,932	$	70,440	$	2,845	$	154,217
Goodwill acquired during the year	—		8,570		—		8,570
Balance at December 31, 2011	80,932		79,010		2,845		162,787
Goodwill acquired during the year	—		550		—		550
Balance at December 31, 2012	$	80,932	$	79,560	$	2,845	$	163,337