Other, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ 1,349	$ (164)
Gain (Loss) on Disposition of Other Assets	(2,066)	1,085
Gain on sale of the Joaquin project	21,138	0
Impairment of equity securities	(121)	0
Other	839	393
Other, net	$ 21,139	$ 1,314