Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Accrual for loss contingency related to legal proceedings	$ 0	$ 22,000	$ 123,800
Changes in the carrying amount of goodwill
Goodwill, balance beginning	26,274	27,388
Impact of foreign currency translation adjustments	(4,066)	(1,114)
Goodwill, balance ending	22,208	26,274	27,388
E & P Technology & Services [Member]
Changes in the carrying amount of goodwill
Goodwill, balance beginning	2,943	2,943
Impact of foreign currency translation adjustments	0	0
Goodwill, balance ending	2,943	2,943	2,943
E & P Technology & Services [Member] \| Customer relationships [Member]
Changes in the carrying amount of goodwill
Impairment of goodwill			1,400
Optimization Software and Services [Member]
Changes in the carrying amount of goodwill
Goodwill, balance beginning	23,331	24,445
Impact of foreign currency translation adjustments	(4,066)	(1,114)
Goodwill, balance ending	$ 19,265	$ 23,331	24,445
Devices [Member]
Changes in the carrying amount of goodwill
Impairment of goodwill			$ 21,900

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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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

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Amount of loss from the write-down 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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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-Section 50
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