Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Fair value of equity and debt securities	$ 19,862
Assets	27,479	$ 36,399
Liabilities:
Total liabilities	34,225	25,411
Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net	7,614
Provisional metal sales contracts
Assets:
Fair value of other derivative instruments, net	3	753
Liabilities:
Fair value of derivative liability	299	275
Silvertip Mine
Liabilities:
Fair value of derivative liability		25,000
Gold zero cost collars \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net	0	0
Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	33,926	136
Equity Securities
Assets:
Fair value of equity and debt securities	19,862	35,646
Equity and debt securities
Assets:
Fair value of equity and debt securities		35,646
Level 1
Assets:
Assets	19,862	35,646
Liabilities:
Total liabilities	0	0
Level 1 \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net	0
Level 1 \| Provisional metal sales contracts
Assets:
Fair value of other derivative instruments, net	0	0
Liabilities:
Fair value of derivative liability	0	0
Level 1 \| Silvertip Mine
Liabilities:
Fair value of derivative liability		0
Level 1 \| Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	0	0
Level 1 \| Equity Securities
Assets:
Fair value of equity and debt securities	19,862
Level 1 \| Equity and debt securities
Assets:
Fair value of equity and debt securities		35,646
Level 2
Assets:
Assets	7,617	753
Liabilities:
Total liabilities	34,225	411
Level 2 \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net	7,614
Level 2 \| Provisional metal sales contracts
Assets:
Fair value of other derivative instruments, net	3	753
Liabilities:
Fair value of derivative liability	299	275
Level 2 \| Silvertip Mine
Liabilities:
Fair value of derivative liability		0
Level 2 \| Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	33,926	136
Level 2 \| Equity Securities
Assets:
Fair value of equity and debt securities	0
Level 2 \| Equity and debt securities
Assets:
Fair value of equity and debt securities		0
Level 3
Assets:
Assets	0	0
Liabilities:
Total liabilities	0	25,000
Level 3 \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net	0
Level 3 \| Provisional metal sales contracts
Assets:
Fair value of other derivative instruments, net	0	0
Liabilities:
Fair value of derivative liability	0	0
Level 3 \| Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	0	0
Level 3 \| Equity Securities
Assets:
Fair value of equity and debt securities	$ 0
Level 3 \| Equity and debt securities
Assets:
Fair value of equity and debt securities		0
Silvertip Mine \| Level 3
Liabilities:
Fair value of derivative liability		$ 25,000

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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