Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value Adjustments to Comprehensive income (Loss)

	Year Ended December 31,
In thousands	2020		2019		2018
Unrealized gain (loss) on equity securities	$	(11,539)	$	15,348	$	(5,019)
Realized gain (loss) on equity securities	19,140		860		7,964
Zinc options	—		—		753
Interest rate swap, net	—		(178)		(60)
Fair value adjustments, net	$	7,601	$	16,030	$	3,638

Financial assets and liabilities measured at fair value on recurring basis

The following table presents the Company’s financial assets and liabilities measured at fair value on a recurring basis (at least annually) by level within the fair value hierarchy. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

	Fair Value at December 31, 2020
In thousands	Total		Level 1		Level 2		Level 3
Assets:
Equity securities	$	12,943	$	12,943	$	—	$	—
Foreign currency forward exchange contracts	13,747		—		13,747		—
Provisional metal sales contracts	481		—		481		—
	$	27,171	$	12,943	$	14,228	$	—
Liabilities:
Gold zero cost collars	$	24,883	$	—	$	24,883	$	—
Provisional metal sales contracts	67		—		67		—
	$	24,950	$	—	$	24,950	$	—

	Fair Value at December 31, 2019
In thousands	Total		Level 1		Level 2		Level 3
Assets:
Equity and debt securities	$	35,646	$	35,646	$	—	$	—
Provisional metal sales contracts	753		—		753		—
	$	36,399	$	35,646	$	753	$	—
Liabilities:
Silvertip contingent consideration	$	25,000	$	—	$	—	$	25,000
Provisional metal sales contracts	275		—		275		—
Gold zero cost collars	136		—		136		—
	$	25,411	$	—	$	411	$	25,000

Changes in the fair value of the Company's Level 3 financial liabilities

The following tables present the changes in the fair value of the Company's Level 3 financial assets and liabilities in the year ended December 31, 2020 and 2019:

	December 31, 2020
In thousands	Balance at the beginning of the period		Revaluation		Settlements		Accretion		Balance at the end of the period
Liabilities:
Silvertip contingent consideration	$	25,000	$	—	$	(25,000)	$	—	$	—

Financial Assets and Liabilities not Measured at Fair Value

The fair value of financial assets and liabilities carried at book value in the financial statements at December 31, 2020 and December 31, 2019 is presented in the following table:

	December 31, 2020
In thousands	Book Value		Fair Value		Level 1		Level 2		Level 3
Liabilities:
2024 Senior Notes(1)	$	227,590	$	229,874	$	—	$	229,874	$	—
Revolving Credit Facility(2)	$	—	$	—	$	—	$	—	$	—

(1) Net of unamortized debt issuance costs of $2.4 million.

(2) Unamortized debt issuance costs of $1.5 million included in Other Non-Current Assets.

	December 31, 2019
In thousands	Book Value		Fair Value		Level 1		Level 2		Level 3
Liabilities:
2024 Senior Notes(1)	$	226,885	$	228,585	$	—	$	228,585	$	—
Revolving Credit Facility(2)	$	—	$	—	$	—	$	—	$	—

(1) Net of unamortized debt issuance costs of $3.1 million.

(2) Unamortized debt issuance costs of $2.3 million included in Other Non-Current Assets.