Other, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ 10	$ (468)	$ (66)		$ (1,133)
Gain (loss) on sale of assets and investments	9	(72)	18		(20)
Gain (loss) on sale of Manquiri consideration	0	0	365	[1]	0	[1]
Interest Income, Other	0	18	0		199
Gain (loss) on Silvertip consideration	0	0	955		0
Other	102	1,165	730		1,657
Other, net	$ 121	$ 643	$ 2,002		$ 703

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