Goodwill (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in the carrying value of goodwill

Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):

	Energy Chemistry Technologies		Consumer and Industrial Chemistry Technologies			Downhole Tools			Teledrift			Production Technologies			Total
Balance at December 31, 2013:
Goodwill	$	30,296	$	20,642		$	43,009		$	46,396		$	5,861		$	146,204
Accumulated impairment losses	—		—			(43,009		)	(31,063		)	(5,861		)	(79,933		)
Goodwill balance, net	30,296		20,642			—			15,333			—			66,271
Activity during the year 2014:
Goodwill impairment recognized	—		—			—			—			—			—
Acquisition goodwill recognized	6,022		(1,162		)	—			—			—			4,860
Balance at December 31, 2014:
Goodwill	36,318		19,480			43,009			46,396			5,861			151,064
Accumulated impairment losses	—		—			(43,009		)	(31,063		)	(5,861		)	(79,933		)
Goodwill balance, net	36,318		19,480			—			15,333			—			71,131
Activity during the year 2015:
Goodwill impairment recognized	—		—			—			—			—			—
Acquisition goodwill recognized	—		—			—			—			1,689			1,689
Balance at December 31, 2015:
Goodwill	36,318		19,480			43,009			46,396			7,550			152,753
Accumulated impairment losses	—		—			(43,009		)	(31,063		)	(5,861		)	(79,933		)
Goodwill balance, net	$	36,318	$	19,480		$	—		$	15,333		$	1,689		$	72,820