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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Marketable equity securities	$ 2,643	$ 1,339
Level 1
Assets
Marketable equity securities	2,643	1,339
Vendetta Warrants		735
Liabilities
Kinross calls		2
Level 2
Assets
Marketable equity securities
Vendetta Warrants
Liabilities
Kinross calls
Level 3
Assets
Marketable equity securities
Vendetta Warrants
Liabilities
Kinross calls

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- Definition

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

+ References

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Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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