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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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill - Carrying Value of Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill [Roll Forward]
Balance, beginning of period			$ 56,660,000
Goodwill impairment recognized	$ (37,180,000)	$ 0	(37,180,000)	$ 0
Balance, end of period	19,480,000		19,480,000
Energy Chemical Technologies
Goodwill [Roll Forward]
Balance, beginning of period			37,180,000
Goodwill impairment recognized	(37,200,000)		(37,180,000)
Balance, end of period	0		0
Non Energy Chemicals [Member]
Goodwill [Roll Forward]
Balance, beginning of period			19,480,000
Goodwill impairment recognized	0		0
Balance, end of period	$ 19,480,000		$ 19,480,000