Acquisition-Related Obligations (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Acquisition-Related Obligations

Acquisition-related obligations consisted of the following:

	March 31, 2021		December 31, 2020
Contingent Revenue Obligation	$	32,143	$	28,967
Environmental Settlement Obligations	9,979		10,391
UMWA Funds Settlement Liability	2,000		2,000
Discount	(1,120)		(1,491)
Total acquisition-related obligations	43,002		39,867
Less current portion	(19,879)		(19,099)
Acquisition-related obligations, net of current portion	$	23,123	$	20,768