Mining Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Mining Properties
Operational mining properties:	$ 913,953	$ 912,084
Accumulated depletion	(596,214)	(533,195)
Operational mining properties, net	317,739	378,889
Mineral interest	949,172	1,096,315
Accumulated depletion	(554,956)	(503,637)
Mineral interest, net	394,216	592,678
Mineral Properties, Net	711,955	971,567
Palmarejo [Member]
Mining Properties
Operational mining properties:	260,838	239,780
Accumulated depletion	(179,894)	(163,414)
Operational mining properties, net	80,944	76,366
Mineral interest	629,303	629,303
Accumulated depletion	(501,039)	(472,448)
Mineral interest, net	128,264	156,855
Mineral Properties, Net	209,208	233,221
Rochester [Member]
Mining Properties
Operational mining properties:	220,127	200,126
Accumulated depletion	(155,079)	(151,141)
Operational mining properties, net	65,048	48,985
Mineral interest	18,541	18,521
Accumulated depletion		0
Mineral interest, net	18,541	18,521
Mineral Properties, Net	83,589	67,506
Silvertip [Member]
Mining Properties
Operational mining properties:	50,146	101,933
Accumulated depletion	(9,623)	(1,411)
Operational mining properties, net	40,523	100,522
Mineral interest	105,736	252,899
Accumulated depletion	(24,147)	(4,105)
Mineral interest, net	81,589	248,794
Mineral Properties, Net	122,112	349,316
Kensington
Mining Properties
Operational mining properties:	345,026	324,414
Accumulated depletion	(230,869)	(198,456)
Operational mining properties, net	114,157	125,958
Mineral interest		0
Accumulated depletion		0
Mineral interest, net	0	0
Mineral Properties, Net	114,157	125,958
Wharf [Member]
Mining Properties
Operational mining properties:	34,165	41,761
Accumulated depletion	(20,071)	(18,759)
Operational mining properties, net	14,094	23,002
Mineral interest	45,837	45,837
Accumulated depletion	(29,051)	(26,667)
Mineral interest, net	16,786	19,170
Mineral Properties, Net	30,880	42,172
Sterling [Member]
Mining Properties
Operational mining properties:	3,651	4,070
Accumulated depletion	(678)	(14)
Operational mining properties, net	2,973	4,056
Mineral interest	95,499	95,499
Accumulated depletion	0	0
Mineral interest, net	95,499	95,499
Mineral Properties, Net	98,472	99,555
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	5,171	5,171
Accumulated depletion	(719)	(417)
Mineral interest, net	4,452	4,754
Mineral Properties, Net	$ 4,452	$ 4,754