Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill. start	$ 219,412	$ 179,044
Goodwill allocated to discontinued operations		(915)
Goodwill, acquired during period	0	41,283
Adjustments to goodwill acquired in previous year	(5,987)
Goodwill. end	213,425	219,412
Reservoir Description Segment [Member]
Goodwill [Roll Forward]
Goodwill. start	99,484	99,484
Goodwill allocated to discontinued operations		0
Goodwill, acquired during period	0	0
Adjustments to goodwill acquired in previous year	0
Goodwill. end	99,484	99,484
Production Enhancement Segment [Member]
Goodwill [Roll Forward]
Goodwill. start	119,928	79,560
Goodwill allocated to discontinued operations		(915)
Goodwill, acquired during period	0	41,283
Adjustments to goodwill acquired in previous year	(5,987)
Goodwill. end	$ 113,941	$ 119,928

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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