Other, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ (3,104)	$ (39)	$ (7,083)	$ 1,953
Gain (loss) on sale of assets and investments	(28)	878	316	(674)
Write-Down of Manquiri Consideration	(18,599)	0	(18,599)	0
Gain on sale of the Joaquin project	0	0	0	21,138
Gain on repurchase of the Rochester royalty obligation	0	0	0	2,332
Mexico Inflation Adjustment	0	0	1,939	0
Gain (loss) on the sale of the Endeavor stream and other royalties	0	1,172	0	1,172
Other	828	350	3,581	1,213
Other, net	$ (20,903)	$ 2,361	$ (19,846)	$ 27,134