Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Assets	$ 37,869	$ 35,088
Liabilities:
Total liabilities	48,414	48,187
Other derivative instruments, net
Assets:
Fair value of other derivative instruments, net	552	251
Liabilities:
Fair value of derivative liability	125	222
Silvertip Mine
Liabilities:
Fair value of derivative liability	48,289	47,965
Equity and debt securities
Assets:
Fair value of equity and debt securities	37,317	34,837
Equity and debt securities
Assets:
Fair value of equity and debt securities	31,003	28,245
Level 1
Assets:
Assets	31,003	27,946
Liabilities:
Total liabilities	0	0
Level 1 \| Other derivative instruments, net
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	0
Level 1 \| Equity and debt securities
Assets:
Fair value of equity and debt securities	31,003	27,946
Level 2
Assets:
Assets	552	251
Liabilities:
Total liabilities	125	222
Level 2 \| Other derivative instruments, net
Assets:
Fair value of other derivative instruments, net	552	251
Liabilities:
Fair value of derivative liability	125	222
Level 2 \| Silvertip Mine
Liabilities:
Fair value of derivative liability	0	0
Level 2 \| Equity and debt securities
Assets:
Fair value of equity and debt securities	0	0
Level 3
Assets:
Assets	6,314	6,891
Liabilities:
Total liabilities	48,289	47,965
Level 3 \| Other derivative instruments, net
Assets:
Fair value of other derivative instruments, net	0	0
Liabilities:
Fair value of derivative liability	0	0
Level 3 \| Equity and debt securities
Assets:
Fair value of equity and debt securities		6,891
Silvertip Mine
Liabilities:
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	48,289	$ 47,965
Available-for-sale Securities \| Level 3 \| Equity and debt securities
Assets:
Fair value of equity and debt securities	$ 6,314

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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial and nonfinancial obligations.

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