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

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Information [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

Accrued liabilities and other consist of the following:

In thousands	March 31, 2021		December 31, 2020
Accrued salaries and wages	$	21,028	$	30,457
Deferred revenue (1)	8,555		16,425
Income and mining taxes	12,099		26,118
Accrued operating costs	3,608		3,327
Unrealized losses on derivatives	148		24,950
Taxes other than income and mining	3,315		3,616
Accrued interest payable	2,131		1,855
Operating lease liabilities	11,798		12,410
Accrued liabilities and other	$	62,682	$	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 months ended March 31, 2021 and 2020:

In thousands	March 31, 2021		March 31, 2020
Cash and cash equivalents	$	154,066	$	52,895
Restricted cash equivalents	1,377		1,163
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$	155,443	$	54,058