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 accumulated impairment loss for 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 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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Goodwill (Changes in the Carrying Value of Goodwill) (Details) - USD ($)	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in the carrying value of goodwill:
Goodwill	$ 56,660,000				$ 56,660,000	$ 56,660,000	$ 55,798,000
Accumulated impairment losses	0				0	0	0
Goodwill	56,660,000				56,660,000	56,660,000	55,798,000
Goodwill impairment recognized	0	$ 0	$ 0	$ 0	0	0	0
Acquisition goodwill recognized					0	862,000
Energy Chemistry Technologies
Changes in the carrying value of goodwill:
Goodwill	37,180,000				37,180,000	37,180,000	36,318,000
Accumulated impairment losses	0				0	0	0
Goodwill	37,180,000				37,180,000	37,180,000	36,318,000
Goodwill impairment recognized					0	0
Acquisition goodwill recognized					0	862,000
Consumer and Industrial Chemistry Technologies
Changes in the carrying value of goodwill:
Goodwill	19,480,000				19,480,000	19,480,000	19,480,000
Accumulated impairment losses	0				0	0	0
Goodwill	$ 19,480,000				19,480,000	19,480,000	$ 19,480,000
Goodwill impairment recognized					0	0
Acquisition goodwill recognized					$ 0	$ 0