Mining Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Mining Properties
Operational mining properties:	$ 997,307	$ 913,953
Accumulated depletion	(650,831)	(596,214)
Operational mining properties, net	346,476	317,739
Mineral interest	946,226	949,172
Accumulated depletion	(575,911)	(554,956)
Mineral interest, net	370,315	394,216
Mineral Properties, Net	716,790	711,955
Palmarejo [Member]
Mining Properties
Operational mining properties:	280,184	260,838
Accumulated depletion	(194,898)	(179,894)
Operational mining properties, net	85,286	80,944
Mineral interest	629,303	629,303
Accumulated depletion	(518,866)	(501,039)
Mineral interest, net	110,437	128,264
Mineral Properties, Net	195,723	209,208
Rochester [Member]
Mining Properties
Operational mining properties:	270,648	220,127
Accumulated depletion	(157,526)	(155,079)
Operational mining properties, net	113,122	65,048
Mineral interest	18,541	18,541
Accumulated depletion	0	0
Mineral interest, net	18,541	18,541
Mineral Properties, Net	131,663	83,589
Silvertip [Member]
Mining Properties
Operational mining properties:	48,589	50,146
Accumulated depletion	(10,747)	(9,623)
Operational mining properties, net	37,842	40,523
Mineral interest	105,736	105,736
Accumulated depletion	(24,828)	(24,147)
Mineral interest, net	80,908	81,589
Mineral Properties, Net	118,750	122,112
Kensington
Mining Properties
Operational mining properties:	360,201	345,026
Accumulated depletion	(264,014)	(230,869)
Operational mining properties, net	96,187	114,157
Mineral interest	0	0
Accumulated depletion	0	0
Mineral interest, net	0	0
Mineral Properties, Net	96,187	114,157
Wharf [Member]
Mining Properties
Operational mining properties:	33,578	34,165
Accumulated depletion	(22,547)	(20,071)
Operational mining properties, net	11,031	14,094
Mineral interest	48,062	45,837
Accumulated depletion	(32,217)	(29,051)
Mineral interest, net	15,845	16,786
Mineral Properties, Net	26,876	30,880
Sterling [Member]
Mining Properties
Operational mining properties:	4,107	3,651
Accumulated depletion	(1,099)	(678)
Operational mining properties, net	3,008	2,973
Mineral interest	95,499	95,499
Accumulated depletion	0	0
Mineral interest, net	95,499	95,499
Mineral Properties, Net	98,507	98,472
La Preciosa [Member]
Mining Properties
Operational mining properties:	0	0
Accumulated depletion	0	0
Operational mining properties, net	0	0
Mineral interest	49,085	49,085
Accumulated depletion	0	0
Mineral interest, net	49,085	49,085
Mineral Properties, Net	49,085	49,085
Other Mining Properties [Member]
Mining Properties
Operational mining properties:	0	0
Accumulated depletion	0	0
Operational mining properties, net	0	0
Mineral interest	0	5,171
Accumulated depletion	0	(719)
Mineral interest, net	0	4,452
Mineral Properties, Net	$ 0	$ 4,452