Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Fair value of equity and debt securities	$ 174,370
Assets	182,042	$ 27,171
Liabilities:
Total liabilities	9,767	24,950
Provisional metal sales contracts
Assets:
Fair value of other derivative instruments, net	137	481
Liabilities:
Fair value of derivative liability	420	67
Gold zero cost collars
Liabilities:
Fair value of derivative liability		24,883
Gold zero cost collars \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net		0
Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	78
Foreign Exchange Forward
Assets:
Fair value of other derivative instruments, net	7,535	13,747
Foreign Exchange Forward \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net		13,747
Foreign Exchange Forward \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	0	0
Embedded Derivative Financial Instruments \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	9,269
Equity Securities
Assets:
Fair value of equity and debt securities	174,370	12,943
Equity and debt securities
Assets:
Fair value of equity and debt securities		12,943
Level 1
Assets:
Assets	174,370	12,943
Liabilities:
Total liabilities	0	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 \| Gold zero cost collars
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
Level 1 \| Foreign Exchange Forward
Assets:
Fair value of other derivative instruments, net	0	0
Level 1 \| Embedded Derivative Financial Instruments \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	0
Level 1 \| Equity Securities
Assets:
Fair value of equity and debt securities	174,370
Level 1 \| Equity and debt securities
Assets:
Fair value of equity and debt securities		12,943
Level 2
Assets:
Assets	7,672	14,228
Liabilities:
Total liabilities	498	24,950
Level 2 \| Prepaid expenses and other \| Designated as Hedging Instrument
Assets:
Fair value of other derivative instruments, net	7,535	13,747
Level 2 \| Provisional metal sales contracts
Assets:
Fair value of other derivative instruments, net	137	481
Liabilities:
Fair value of derivative liability	9,689	67
Level 2 \| Gold zero cost collars
Assets:
Fair value of other derivative instruments, net	0
Liabilities:
Fair value of derivative liability		24,883
Level 2 \| Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	78	24,883
Level 2 \| Foreign Exchange Forward
Assets:
Fair value of other derivative instruments, net	7,535	13,747
Level 2 \| Embedded Derivative Financial Instruments \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	0
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	9,269	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
Liabilities:
Fair value of derivative liability		0
Level 3 \| Gold zero cost collars \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	0
Level 3 \| Foreign Exchange Forward
Assets:
Fair value of other derivative instruments, net	0	0
Level 3 \| Embedded Derivative Financial Instruments \| Accrued liabilities and other \| Designated as Hedging Instrument
Liabilities:
Fair value of derivative liability	9,269
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

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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