Goodwill (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
May 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Changes in the carrying value of goodwill:
Goodwill, beginning balance		$ 146,204us-gaap_GoodwillGross	$ 106,876us-gaap_GoodwillGross
Accumulated impairment losses, beginning balance		(79,933)	(79,933)
Goodwill balance, net, beginnging balance		66,271us-gaap_Goodwill	26,943us-gaap_Goodwill
Goodwill impairment recognized		0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Acquisition goodwill recognized	39,300us-gaap_GoodwillAcquiredDuringPeriod	4,860us-gaap_GoodwillAcquiredDuringPeriod	39,328us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, ending balance		151,064us-gaap_GoodwillGross	146,204us-gaap_GoodwillGross
Accumulated impairment losses, ending balance		(79,933)	(79,933)
Goodwill balance, net, ending balance		71,131us-gaap_Goodwill	66,271us-gaap_Goodwill
Energy Chemical Technologies [Member]
Changes in the carrying value of goodwill:
Goodwill, beginning balance		30,296	11,610
Accumulated impairment losses, beginning balance		0	0
Goodwill balance, net, beginnging balance		30,296	11,610
Goodwill impairment recognized		0	0
Acquisition goodwill recognized	18,700	6,022	18,686
Goodwill, ending balance		36,318	30,296
Accumulated impairment losses, ending balance		0	0
Goodwill balance, net, ending balance		36,318	30,296
Consumer and Industrial Chemical Technologies [Member]
Changes in the carrying value of goodwill:
Goodwill, beginning balance		20,642	0
Accumulated impairment losses, beginning balance		0	0
Goodwill balance, net, beginnging balance		20,642	0
Goodwill impairment recognized		0	0
Acquisition goodwill recognized	20,600	(1,162)	20,642
Goodwill, ending balance		19,480	20,642
Accumulated impairment losses, ending balance		0	0
Goodwill balance, net, ending balance		19,480	20,642
Downhole Tool [Member]
Changes in the carrying value of goodwill:
Goodwill, beginning balance		43,009	43,009
Accumulated impairment losses, beginning balance		(43,009)	(43,009)
Goodwill balance, net, beginnging balance		0	0
Goodwill impairment recognized		0	0
Acquisition goodwill recognized		0	0
Goodwill, ending balance		43,009	43,009
Accumulated impairment losses, ending balance		(43,009)	(43,009)
Goodwill balance, net, ending balance		0	0
Teledrift [Member]
Changes in the carrying value of goodwill:
Goodwill, beginning balance		46,396	46,396
Accumulated impairment losses, beginning balance		(31,063)	(31,063)
Goodwill balance, net, beginnging balance		15,333	15,333
Goodwill impairment recognized		0	0
Acquisition goodwill recognized		0	0
Goodwill, ending balance		46,396	46,396
Accumulated impairment losses, ending balance		(31,063)	(31,063)
Goodwill balance, net, ending balance		15,333	15,333
Production Technologies [Member]
Changes in the carrying value of goodwill:
Goodwill, beginning balance		5,861	5,861
Accumulated impairment losses, beginning balance		(5,861)	(5,861)
Goodwill balance, net, beginnging balance		0	0
Goodwill impairment recognized		0	0
Acquisition goodwill recognized		0	0
Goodwill, ending balance		5,861	5,861
Accumulated impairment losses, ending balance		(5,861)	(5,861)
Goodwill balance, net, ending balance		$ 0	$ 0

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

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-Section 50

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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.

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