- Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Aug. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 43,620	$ 19,995
Goodwill, acquisition		562	23,188
Goodwill, effects of foreign currency		(350)	437
Goodwill, ending balance		43,832	43,620
Fluids systems [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		1,782	1,666
Goodwill, acquisition	$ 0	0
Goodwill, effects of foreign currency		(141)	116
Goodwill, ending balance		1,641	1,782
Mats and integrated services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance		41,838	18,329
Goodwill, acquisition		562	23,188
Goodwill, effects of foreign currency		(209)	321
Goodwill, ending balance		$ 42,191	$ 41,838

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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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.

+ References

No definition available.

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