Goodwill (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015, and 2014 were as follows (in thousands):

	Reservoir Description		Production Enhancement		ReservoirManagement		Total
Balance at December 31, 2013	$	80,932	$	79,560	$	2,845	$	163,337
Goodwill acquired during the year	1,127		—		—		1,127
Balance at December 31, 2014	82,059		79,560		2,845		164,464
Goodwill acquired during the year	13,695		—		—		13,695
Balance at December 31, 2015	$	95,754	$	79,560	$	2,845	$	178,159