Mining Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Mining Properties
Operational mining properties:	$ 912,084	$ 804,845
Accumulated depletion	(533,195)	(485,368)
Operational mining properties, net	378,889	319,477
Mineral interest	1,096,315	969,341
Accumulated depletion	(503,637)	(459,249)
Mineral interest, net	592,678	510,092
Total mining properties	971,567	829,569
Palmarejo [Member]
Mining Properties
Operational mining properties:	239,780	214,383
Accumulated depletion	(163,414)	(146,598)
Operational mining properties, net	76,366	67,785
Mineral interest	629,303	629,303
Accumulated depletion	(472,448)	(435,215)
Mineral interest, net	156,855	194,088
Total mining properties	233,221	261,873
Rochester [Member]
Mining Properties
Operational mining properties:	200,126	193,881
Accumulated depletion	(151,141)	(144,390)
Operational mining properties, net	48,985	49,491
Mineral interest	18,521	0
Accumulated depletion	0	0
Mineral interest, net	18,521	0
Total mining properties	67,506	49,491
Silvertip [Member]
Mining Properties
Operational mining properties:	101,933	57,214
Accumulated depletion	(1,411)	0
Operational mining properties, net	100,522	57,214
Mineral interest	252,899	245,116
Accumulated depletion	(4,105)	0
Mineral interest, net	248,794	245,116
Total mining properties	349,316	302,330
Kensington [Member]
Mining Properties
Operational mining properties:	324,414	298,749
Accumulated depletion	(198,456)	(178,632)
Operational mining properties, net	125,958	120,117
Mineral interest	0	0
Accumulated depletion	0	0
Mineral interest, net	0	0
Total mining properties	125,958	120,117
Wharf [Member]
Mining Properties
Operational mining properties:	41,761	40,618
Accumulated depletion	(18,759)	(15,748)
Operational mining properties, net	23,002	24,870
Mineral interest	45,837	45,837
Accumulated depletion	(26,667)	(24,034)
Mineral interest, net	19,170	21,803
Total mining properties	42,172	46,673
Sterling [Member]
Mining Properties
Operational mining properties:	4,070
Accumulated depletion	(14)
Operational mining properties, net	4,056
Mineral interest	95,499
Accumulated depletion	0
Mineral interest, net	95,499
Total mining properties	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
Total mining properties	49,085	$ 49,085
Other Mining Properties [Member]
Mining Properties
Operational mining properties:	0
Accumulated depletion	0
Operational mining properties, net	0
Mineral interest	5,171
Accumulated depletion	(417)
Mineral interest, net	4,754
Total mining properties	$ 4,754