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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial information relating to reporting segments                      
Revenue $ 195,040 $ 199,469 $ 162,123 $ 154,870 $ 143,855 $ 148,795 $ 169,987 $ 163,267 $ 711,502 $ 625,904 $ 709,598
Amortization 48,118 45,678 43,204 41,876 37,053 31,184 29,459 30,777 178,876 128,473 146,549
Impairment of Long-Lived Assets Held-for-use                 250,814 0 0
Other operating expenses                 52,914 51,388 52,552
Loss on debt extinguishments                 (1,281) 0 (9,342)
Fair value adjustments, net, pretax                 16,030 3,638 (864)
Interest expense, net of capitalized interest                 (24,771) (24,364) (16,440)
Other, net                 (3,193) (24,705) 26,643
Income and mining tax (expense) benefit                 11,129 16,780 (28,998)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (270,961) (14,277) (36,764) (24,894) 468 (53,044) 2,930 691 (346,896) (48,955) 10,925
NET INCOME (LOSS) (270,961) (14,277) (36,764) (19,201) 468 (53,044) 2,930 1,241 (341,203) (48,405) (1,319)
Income (loss) from discontinued operations 0 0 0 5,693 0 0 0 550 5,693 550 (12,244)
Assets, Net [1] 1,215,783       1,550,671 1,550,671     1,215,783 1,550,671 1,344,553
Capital expenditures 20,907 30,678 20,749 27,438 17,805 39,472 41,165 42,345 99,772 140,787 136,734
Palmarejo [Member]                      
Financial information relating to reporting segments                      
Amortization                 59,379 60,744 73,744
Impairment of Long-Lived Assets Held-for-use                 0    
Other operating expenses                 4,591 3,043 1,263
Loss on debt extinguishments                 0   0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (444) (2,137) (487)
Other, net                 (4,798) (8,308) (851)
Income and mining tax (expense) benefit                 (14,257) (15,724) (24,330)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 21,647 25,196 16,034
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 319,292         363,024     319,292   377,621
Capital expenditures                 32,658 29,425 29,902
Rochester [Member]                      
Financial information relating to reporting segments                      
Amortization                 18,041 20,909 22,306
Impairment of Long-Lived Assets Held-for-use                 0    
Other operating expenses                 4,572 7,071 3,394
Loss on debt extinguishments                 0   0
Fair value adjustments, net, pretax                 0 0 (864)
Interest expense, net of capitalized interest                 (1,015) (466) (496)
Other, net                 (378) (1,211) 2,193
Income and mining tax (expense) benefit                 (709) (874) (1,028)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (13,553) 5,268 17,512
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 284,878         269,903     284,878   239,223
Capital expenditures                 22,592 9,919 40,874
Kensington                      
Financial information relating to reporting segments                      
Amortization                 50,592 29,508 36,022
Impairment of Long-Lived Assets Held-for-use                 0    
Other operating expenses                 1,248 1,721 1,412
Loss on debt extinguishments                 0   0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (1,333) (973) (413)
Other, net                 (704) 2,795 (922)
Income and mining tax (expense) benefit                 0 0 0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 2,044 (14,718) (9,000)
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 194,076         224,460     194,076   212,588
Capital expenditures                 23,513 44,738 36,248
Wharf [Member]                      
Financial information relating to reporting segments                      
Amortization                 12,280 11,072 13,012
Impairment of Long-Lived Assets Held-for-use                 0    
Other operating expenses                 2,832 2,686 2,468
Loss on debt extinguishments                 0   0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (100) (40) (66)
Other, net                 89 (834) 172
Income and mining tax (expense) benefit                 (3,041) (1,063) (3,936)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 22,289 13,516 36,949
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 84,765         102,246     84,765   104,010
Capital expenditures                 2,220 3,382 8,844
Silvertip [Member]                      
Financial information relating to reporting segments                      
Amortization                 36,738 5,235 0
Impairment of Long-Lived Assets Held-for-use                 250,814    
Other operating expenses                 1,216 303 153
Loss on debt extinguishments                 0   0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (1,137) (766) (2,212)
Other, net                 (557) (370) 1,142
Income and mining tax (expense) benefit                 32,084 16,057 (932)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (325,353) (20,085) (2,155)
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 164,125         415,998     164,125   339,369
Capital expenditures                 17,504 52,932 17,684
Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Amortization                 1,846 1,005 1,465
Impairment of Long-Lived Assets Held-for-use                 0    
Other operating expenses                 38,455 36,564 43,862
Loss on debt extinguishments                 (1,281)   (9,342)
Fair value adjustments, net, pretax                 16,030 3,638 0
Interest expense, net of capitalized interest                 (20,742) (19,982) (12,766)
Other, net                 3,155 (16,777) 24,909
Income and mining tax (expense) benefit                 (2,948) 18,384 1,228
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (53,970) (58,132) (48,415)
Income (loss) from discontinued operations                 5,693 550 (12,244)
Assets, Net [1] 168,647         175,040     168,647   71,742
Capital expenditures                 1,285 391 3,182
Gold [Member]                      
Financial information relating to reporting segments                      
Revenue                 493,347 427,008 494,249
Gold [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 141,669 131,758 146,187
Gold [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 50,225 66,556 68,964
Gold [Member] | Kensington                      
Financial information relating to reporting segments                      
Revenue                 181,111 132,924 154,469
Gold [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 120,342 95,770 124,629
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                 191,478 193,153 215,349
Product, Silver | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 111,032 113,998 128,622
Product, Silver | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 61,799 75,252 83,716
Product, Silver | Kensington                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Silver | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 1,072 746 1,272
Product, Silver | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 17,575 3,157 0
Product, Silver | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 1,739
Product, Zinc                      
Financial information relating to reporting segments                      
Revenue                 12,806 3,612  
Product, Zinc | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Zinc | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Zinc | Kensington                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Zinc | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Zinc | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 12,806 3,612  
Product, Zinc | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Lead                      
Financial information relating to reporting segments                      
Revenue                 13,871 2,131  
Product, Lead | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Lead | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Lead | Kensington                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Lead | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Lead | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 13,871 2,131  
Product, Lead | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0  
Product, Metal [Member]                      
Financial information relating to reporting segments                      
Revenue                 711,502 625,904 709,598
Product, Metal [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 252,701 245,756 274,809
Product, Metal [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 112,024 141,808 152,680
Product, Metal [Member] | Kensington                      
Financial information relating to reporting segments                      
Revenue                 181,111 132,924 154,469
Product, Metal [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 121,414 96,516 125,901
Product, Metal [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 44,252 8,900 0
Product, Metal [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 1,739
Product                      
Financial information relating to reporting segments                      
Costs applicable to sales 146,631 140,952 131,948 131,650 116,507 116,857 108,246 99,340 551,181 [2] 440,950 [2] 440,260 [2]
Product | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 141,927 120,088 146,176
Product | Rochester [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 100,205 105,677 107,921
Product | Kensington                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 119,602 112,364 116,096
Product | Wharf [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 80,689 67,201 69,322
Product | Silvertip [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 108,758 35,620 0
Product | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 0 0 745
Mineral, Exploration                      
Financial information relating to reporting segments                      
Costs applicable to sales $ 7,201 $ 5,893 $ 5,719 $ 3,714 $ 4,128 $ 8,157 $ 6,429 $ 6,683 22,527 25,397 30,311
Impairment of Long-Lived Assets Held-for-use                 250,814    
Mineral, Exploration | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 5,658 10,516 11,924
Mineral, Exploration | Rochester [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 657 332 1,352
Mineral, Exploration | Kensington                      
Financial information relating to reporting segments                      
Costs applicable to sales                 5,588 5,871 8,604
Mineral, Exploration | Wharf [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 272 104 320
Mineral, Exploration | Silvertip [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 2,469 2,748 0
Mineral, Exploration | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 $ 7,883 $ 5,826 $ 8,111
[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interests
[2] Excludes amortization.