Impairments (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Text Block Supplement [Abstract]

Schedule of Asset Impairment Charges

, we have recorded impairment charges (in thousands) for the years ended December 31, 2019 and 2018 for the following assets:

Description	December 31, 2019		December 31, 2018
Inventories, net	$	4,100	$	3,316
Property, plant and mine development, net	243,064		109,938
Operating lease right-of-use assets	115,443		—
Goodwill	—		164,167
Intangible assets, net	1,240		4,478
Total	$	363,847	$	281,899