Acquisition-Related Obligations (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Acquisition-Related Obligations

Acquisition-related obligations consisted of the following:

	September 30, 2020		December 31, 2019
Contingent Revenue Obligation	$	24,292	$	52,427
Environmental Settlement Obligations	11,152		16,305
Reclamation Funding Liability	—		12,000
UMWA Funds Settlement Liability	4,000		4,000
Discount	(1,952)		(4,834)
Total acquisition-related obligations	37,492		79,898
Less current portion	(18,206)		(33,639)
Acquisition-related obligations, net of current portion	$	19,286	$	46,259