Acquisition-Related Obligations (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Acquisition-Related Obligations

Acquisition-related obligations consisted of the following:

	June 30, 2021		December 31, 2020
Contingent Revenue Obligation	$	23,904	$	28,967
Environmental Settlement Obligations	9,702		10,391
UMWA Funds Settlement Liability	2,000		2,000
Discount	(768)		(1,491)
Total acquisition-related obligations	34,838		39,867
Less current portion	(22,866)		(19,099)
Acquisition-related obligations, net of current portion	$	11,972	$	20,768