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Mining Properties (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Mining Properties |  |
Operational mining properties: | $ 804,845 | $ 648,780
Accumulated depletion | (485,368) | (439,682)
Operational mining properties, net | 319,477 | 209,098
Mineral interest | 969,341 | 771,497
Accumulated depletion | (459,249) | (430,305)
Mineral interest, net | 510,092 | 341,192
Total mining properties | 829,569 | 550,290
Palmarejo [Member] |  |
Mining Properties |  |
Operational mining properties: | 214,383 | 174,890
Accumulated depletion | (146,598) | (134,995)
Operational mining properties, net | 67,785 | 39,895
Mineral interest | 629,303 | 629,303
Accumulated depletion | (435,215) | (381,686)
Mineral interest, net | 194,088 | 247,617
Total mining properties | 261,873 | 287,512
Rochester [Member] |  |
Mining Properties |  |
Operational mining properties: | 193,881 | 165,230
Accumulated depletion | (144,390) | (138,244)
Operational mining properties, net | 49,491 | 26,986
Mineral interest | 0 | 0
Accumulated depletion | 0 | 0
Mineral interest, net | 0 | 0
Total mining properties | 49,491 | 26,986
Silvertip [Member] |  |
Mining Properties |  |
Operational mining properties: | 57,214 |
Accumulated depletion | 0 |
Operational mining properties, net | 57,214 |
Mineral interest | 245,116 |
Accumulated depletion | 0 |
Mineral interest, net | 245,116 |
Total mining properties | 302,330 |
Kensington [Member] |  |
Mining Properties |  |
Operational mining properties: | 298,749 | 271,175
Accumulated depletion | (178,632) | (154,744)
Operational mining properties, net | 120,117 | 116,431
Mineral interest | 0 | 0
Accumulated depletion | 0 | 0
Mineral interest, net | 0 | 0
Total mining properties | 120,117 | 116,431
Wharf [Member] |  |
Mining Properties |  |
Operational mining properties: | 40,618 | 37,485
Accumulated depletion | (15,748) | (11,699)
Operational mining properties, net | 24,870 | 25,786
Mineral interest | 45,837 | 45,837
Accumulated depletion | (24,034) | (19,249)
Mineral interest, net | 21,803 | 26,588
Total mining properties | 46,673 | 52,374
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
Joaquin Project - Argentina |  |
Mining Properties |  |
Operational mining properties: |  | 0
Accumulated depletion |  |
Operational mining properties, net |  | 0
Mineral interest |  | 10,000
Accumulated depletion |  | 0
Mineral interest, net |  | 10,000
Total mining properties |  | 10,000
Other Mining Properties [Member] |  |
Mining Properties |  |
Operational mining properties: |  | 0
Accumulated depletion |  | 0
Operational mining properties, net |  | 0
Mineral interest |  | 37,272
Accumulated depletion |  | (29,370)
Mineral interest, net |  | 7,902
Total mining properties |  | $ 7,902

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