Other, Net (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)		$ (76)	$ (665)
Gain (loss) on sale of assets and investments		9	52
Gain (loss) on sale of Manquiri consideration	[1]	365	0
Interest Income, Other		0	180
Gain (loss) on Silvertip consideration		955	0
Other		628	493
Other, net		$ 1,881	$ 60

[1] As defined in Note 18 -- Discontinued Operations.