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Short-term and Other Investments, Summary (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Other Investments
Fair value at beginning of period	$ 5,462
Gain (loss) during the period	(624)	$ 2,028
Fair value at end of period	4,838		$ 5,462
Midas Gold Shares
Other Investments
Fair value at beginning of period	5,462	$ 3,746	3,746
Gain (loss) during the period	(624)		1,716
Fair value at end of period	$ 4,838		$ 5,462
Midas Gold Shares held at end of the period	7,802,615		7,802,615

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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