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Other Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Expense, Net
Unrealized currency exchange loss (gain)	$ 1,100	$ (625)	$ 74	$ (27)
Realized currency exchange (gain) loss	(735)	929	589	993
Unrealized (gain) loss from gold and silver rounds/bullion, net	159	148	141	(156)
Loss on disposal of fixed assets		205	5	301
Other (income) expense	(14)	(48)	(21)	(38)
Total	$ 510	$ 609	$ 788	$ 1,073

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Unrealized Investment Gains Losses

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

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Amount of income (expense) related to nonoperating activities, classified as other.

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