Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Restructuring - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0	$ 899	$ 172	$ 899
Employee Severance \| ADA Carbon Solutions, LLC
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 600