Supplemental Financial Information (Tables)

3 Months Ended

Mar. 31, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Assets and Other assets

The following table summarizes the components of Prepaid expenses and other assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:



	As of
(in thousands)	March 31, 2020		December 31, 2019
Prepaid expenses and other assets:
Prepaid expenses	$	1,592	$	1,708
Prepaid income taxes	4,772		4,228
Other	1,241		1,896
	$	7,605	$	7,832
Other long-term assets, net:
Right of use assets, operating leases, net	$	4,358	$	5,073
Spare parts, net	3,360		3,453
Mine development costs, net	7,457		7,084
Mine reclamation asset, net	2,423		2,451
Highview Investment	552		552
Other long-term assets	1,842		1,718
	$	19,992	$	20,331

Schedule of Other Liabilities

The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets:



	As of
(in thousands)	March 31, 2020		December 31, 2019
Other current liabilities:
Current portion of operating lease obligations	$	2,142	$	2,382
Accrued interest	298		213
Income and other taxes payable	805		678
Other	1,030		1,038
	$	4,275	$	4,311
Other long-term liabilities:
Operating lease obligations, long-term	$	2,415	$	2,810
Mine reclamation liability	2,752		2,721
Other	71		229
	$	5,238	$	5,760

Schedule of Statement of Operations, Supplemental Disclosures

The following table details the components of Interest expense in the Condensed Consolidated Statements of Operations:



	Three Months Ended March 31,
(in thousands)	2020		2019
Interest on Senior Term Loan	$	630	$	1,270
Debt discount and debt issuance costs	354		381
453A interest	132		322
Other	94		131
	$	1,210	$	2,104