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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial information relating to reporting segments                      
Revenue $ 228,317 $ 229,728 $ 154,249 $ 173,167 $ 195,040 $ 199,469 $ 162,123 $ 154,870 $ 785,461 $ 711,502 $ 625,904
Amortization 35,133 32,216 27,876 36,162 48,118 45,678 43,204 41,876 131,387 178,876 128,473
Other operating expenses                 89,376 52,914 51,388
Loss on debt extinguishments                 0 (1,281) 0
Fair value adjustments, net, pretax                 7,601 16,030 3,638
Interest expense, net of capitalized interest                 (20,708) (24,771) (24,364)
Other, net                 (5,941) (3,193) (24,705)
Income and mining tax (expense) benefit                 (37,045) 11,129 16,780
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 11,880 26,856 (1,209) (11,900) (270,961) (14,277) (36,764) (24,894) 25,627 (346,896) (48,955)
NET INCOME (LOSS)                 25,627 (341,203) (48,405)
Income (loss) from discontinued operations 0 0 0 0 0 0 0 5,693 0 5,693 550
Assets, Net [1] 1,232,153       1,215,783       1,232,153 1,215,783 1,550,671
Capital expenditures 37,393 22,996 16,682 22,208 20,907 30,678 20,749 27,438 99,279 99,772 140,787
Impairment of Long-Lived Assets Held-for-use                 0 250,814 0
Palmarejo [Member]                      
Financial information relating to reporting segments                      
Amortization                 44,873 59,379 60,744
Other operating expenses                 7,927 4,591 3,043
Loss on debt extinguishments                 0 0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (918) (444) (2,137)
Other, net                 (5,273) (4,798) (8,308)
Income and mining tax (expense) benefit                 (28,029) (14,257) (15,724)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 67,402 21,647 25,196
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 305,291       319,292       305,291 319,292 363,024
Capital expenditures                 25,511 32,658 29,425
Rochester [Member]                      
Financial information relating to reporting segments                      
Amortization                 14,306 18,041 20,909
Other operating expenses                 5,144 4,572 7,071
Loss on debt extinguishments                 0 0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (1,142) (1,015) (466)
Other, net                 (2,718) (378) (1,211)
Income and mining tax (expense) benefit                 (863) (709) (874)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (3,335) (13,553) 5,268
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 346,986       284,878       346,986 284,878 269,903
Capital expenditures                 37,542 22,592 9,919
Kensington                      
Financial information relating to reporting segments                      
Amortization                 49,477 50,592 29,508
Other operating expenses                 12,012 1,248 1,721
Loss on debt extinguishments                 0 0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (1,017) (1,333) (973)
Other, net                 (18) (704) 2,795
Income and mining tax (expense) benefit                 (1,244) 0 0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 22,434 2,044 (14,718)
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 169,414       194,076       169,414 194,076 224,460
Capital expenditures                 19,825 23,513 44,738
Wharf [Member]                      
Financial information relating to reporting segments                      
Amortization                 12,473 12,280 11,072
Other operating expenses                 838 2,832 2,686
Loss on debt extinguishments                 0 0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (182) (100) (40)
Other, net                 (69) 89 (834)
Income and mining tax (expense) benefit                 (6,644) (3,041) (1,063)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 59,501 22,289 13,516
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 75,047       84,765       75,047 84,765 102,246
Capital expenditures                 2,447 2,220 3,382
Silvertip [Member]                      
Financial information relating to reporting segments                      
Amortization                 8,923 36,738 5,235
Other operating expenses                 23,123 1,216 303
Loss on debt extinguishments                 0 0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (672) (1,137) (766)
Other, net                 1,793 (557) (370)
Income and mining tax (expense) benefit                 0 32,084 16,057
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (58,927) (325,353) (20,085)
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 157,529       164,125       157,529 164,125 415,998
Capital expenditures                 13,144 17,504 52,932
Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Amortization                 1,335 1,846 1,005
Other operating expenses                 40,332 38,455 36,564
Loss on debt extinguishments                 0 (1,281) 0
Fair value adjustments, net, pretax                 7,601 16,030 3,638
Interest expense, net of capitalized interest                 (16,777) (20,742) (19,982)
Other, net                 344 3,155 (16,777)
Income and mining tax (expense) benefit                 (265) (2,948) 18,384
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (61,448) (53,970) (58,132)
Income (loss) from discontinued operations                 0 5,693 550
Assets, Net [1] 177,886       168,647       177,886 168,647 175,040
Capital expenditures                 810 1,285 391
Gold [Member]                      
Financial information relating to reporting segments                      
Revenue                 584,633 493,347 427,008
Gold [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 154,056 141,669 131,758
Gold [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 46,337 50,225 66,556
Gold [Member] | Kensington                      
Financial information relating to reporting segments                      
Revenue                 216,497 181,111 132,924
Gold [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 167,743 120,342 95,770
Gold [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Gold [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Silver                      
Financial information relating to reporting segments                      
Revenue                 200,175 191,478 193,153
Product, Silver | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 132,525 111,032 113,998
Product, Silver | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 63,916 61,799 75,252
Product, Silver | Kensington                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Silver | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 2,504 1,072 746
Product, Silver | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 1,230 17,575 3,157
Product, Silver | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Zinc                      
Financial information relating to reporting segments                      
Revenue                 (662) 12,806 3,612
Product, Zinc | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Zinc | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Zinc | Kensington                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Zinc | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Zinc | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 (662) 12,806 3,612
Product, Zinc | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Lead                      
Financial information relating to reporting segments                      
Revenue                 1,315 13,871 2,131
Product, Lead | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Lead | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Lead | Kensington                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Lead | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Lead | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 1,315 13,871 2,131
Product, Lead | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Metal [Member]                      
Financial information relating to reporting segments                      
Revenue                 785,461 711,502 625,904
Product, Metal [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 286,581 252,701 245,756
Product, Metal [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 110,253 112,024 141,808
Product, Metal [Member] | Kensington                      
Financial information relating to reporting segments                      
Revenue                 216,497 181,111 132,924
Product, Metal [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 170,247 121,414 96,516
Product, Metal [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 1,883 44,252 8,900
Product, Metal [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product                      
Financial information relating to reporting segments                      
Costs applicable to sales 118,631 112,772 90,015 118,917 146,631 140,952 131,948 131,650 440,335 [2] 551,181 [2] 440,950 [2]
Product | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 125,204 141,927 120,088
Product | Rochester [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 86,112 100,205 105,677
Product | Kensington                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 121,727 119,602 112,364
Product | Wharf [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 89,635 80,689 67,201
Product | Silvertip [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 17,657 108,758 35,620
Product | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 0 0 0
Mineral, Exploration                      
Financial information relating to reporting segments                      
Costs applicable to sales $ 11,584 $ 12,818 $ 11,855 $ 6,386 $ 7,201 $ 5,893 $ 5,719 $ 3,714 42,643 22,527 25,397
Impairment of Long-Lived Assets Held-for-use                 0 250,814 0
Mineral, Exploration | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 6,955 5,658 10,516
Impairment of Long-Lived Assets Held-for-use                 0 0 0
Mineral, Exploration | Rochester [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 3,303 657 332
Impairment of Long-Lived Assets Held-for-use                 0 0 0
Mineral, Exploration | Kensington                      
Financial information relating to reporting segments                      
Costs applicable to sales                 8,568 5,588 5,871
Impairment of Long-Lived Assets Held-for-use                 0 0 0
Mineral, Exploration | Wharf [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 905 272 104
Impairment of Long-Lived Assets Held-for-use                 0 0 0
Mineral, Exploration | Silvertip [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 12,228 2,469 2,748
Impairment of Long-Lived Assets Held-for-use                 0 250,814 0
Mineral, Exploration | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 10,684 7,883 5,826
Impairment of Long-Lived Assets Held-for-use                 $ 0 $ 0 $ 0
[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interests
[2] Excludes amortization.