Goodwill (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]

The changes in the carrying amount of goodwill for each business segment for the years ended December 31, 2011, 2010 and 2009 were as follows (in thousands):

	Reservoir Description		Production Enhancement		ReservoirManagement		Total
Balance at December 31, 2009	$	80,932	$	64,823	$	2,845	$	148,600
Goodwill acquired during the year	—		5,617		—		5,617
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