Additional Balance Sheet Detail and Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2021

Supplemental Cash Flow Information [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities and other consist of the following:

In thousands	June 30, 2021		December 31, 2020
Accrued salaries and wages	$	21,473	$	30,457
Deferred revenue (1)	15,991		16,425
Income and mining taxes	11,407		26,118
Exchange agreement embedded derivative	9,269		—
Accrued operating costs	7,563		3,327
Unrealized losses on derivatives	498		24,950
Taxes other than income and mining	4,325		3,616
Accrued interest payable	7,181		1,855
Operating lease liabilities	11,604		12,410
Accrued liabilities and other	$	89,311	$	119,158

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the statement of financial position that total the same such amounts shown in the statement of cash flows in the three and six months ended June 30, 2021 and 2020:

In thousands	June 30, 2021		June 30, 2020
Cash and cash equivalents	$	124,075	$	70,924
Restricted cash equivalents	1,383		1,384
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	125,458	$	72,308