Other (Expense) Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other (Expense) Income, Net
Unrealized currency exchange (loss) gain	$ 278	$ 127	$ 823	$ (10)
Realized currency exchange gain (loss)	58	(49)	(264)	(96)
Impairment (loss) on gold and silver bullion	(73)		(73)
Unrealized (loss) gain from investments	(780)	100	(1,499)	802
Interest Income	15	13	147	82
Interest expense	(25)	(11)	(51)	(96)
Other (expense) income	(16)	34	(130)	1
Total other income (expense)	$ (543)	$ 214	$ (1,047)	$ 683