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Goodwill (Details) - USD ($)	3 Months Ended		6 Months Ended
Goodwill (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Goodwill [Line Items]
Impairment of goodwill	$ 0	$ 37,180,000	$ 0	$ 37,180,000
Goodwill					$ 0
Goodwill acquired during period	$ 0		$ 0
Energy Chemistry Technologies
Goodwill [Line Items]
Impairment of goodwill		$ 37,200,000