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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financial information relating to reporting segments      
Revenue $ 154,870 $ 163,267  
Amortization 41,876 30,777  
Other operating expenses 13,908 13,029  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 9,120 4,654  
Interest expense, net of capitalized interest (6,454) (5,965)  
Other, net 60 513  
Income and mining tax (expense) benefit 8,658 (11,949)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (24,894) 691  
Income (loss) from discontinued operations 5,693 550  
Assets, Net [1] 1,548,399 1,424,210 $ 1,550,671
Capital expenditures 27,438 42,345  
Palmarejo [Member]      
Financial information relating to reporting segments      
Amortization 14,528 16,325  
Other operating expenses 702 731  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 0 0  
Interest expense, net of capitalized interest (136) (119)  
Other, net (1,040) (2,144)  
Income and mining tax (expense) benefit 1,291 (12,443)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 3,856 3,209  
Income (loss) from discontinued operations 0 0  
Assets, Net [1] 360,734 377,146  
Capital expenditures 8,676 9,293  
Rochester [Member]      
Financial information relating to reporting segments      
Amortization 4,037 4,831  
Other operating expenses 962 884  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 0 0  
Interest expense, net of capitalized interest (142) (98)  
Other, net (27) (40)  
Income and mining tax (expense) benefit 144 (371)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (1,198) 2,935  
Income (loss) from discontinued operations 0 0  
Assets, Net [1] 271,403 245,881  
Capital expenditures 4,645 2,633  
Kensington [Member]      
Financial information relating to reporting segments      
Amortization 11,727 6,717  
Other operating expenses 271 321  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 0 0  
Interest expense, net of capitalized interest (229) (243)  
Other, net 13 (37)  
Income and mining tax (expense) benefit 0 0  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (4,584) (1,238)  
Income (loss) from discontinued operations 0 0  
Assets, Net [1] 221,164 215,244  
Capital expenditures 9,356 11,364  
Wharf [Member]      
Financial information relating to reporting segments      
Amortization 2,681 2,657  
Other operating expenses 664 665  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 0 0  
Interest expense, net of capitalized interest (21) (12)  
Other, net 86 (21)  
Income and mining tax (expense) benefit (173) (639)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 3,197 4,120  
Income (loss) from discontinued operations 0 0  
Assets, Net [1] 103,579 104,805  
Capital expenditures 431 344  
Silvertip [Member]      
Financial information relating to reporting segments      
Amortization 8,426 0  
Other operating expenses 241 20  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 0 0  
Interest expense, net of capitalized interest (197) (410)  
Other, net (188) 362  
Income and mining tax (expense) benefit 9,751 835  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (14,800) 767  
Income (loss) from discontinued operations 0 0  
Assets, Net [1] 417,089 361,212  
Capital expenditures 4,077 18,629  
Other Mining Properties [Member]      
Financial information relating to reporting segments      
Amortization 477 247  
Other operating expenses 11,068 10,408  
Loss on debt extinguishments   0  
Fair value adjustments, net, pretax 9,120 4,654  
Interest expense, net of capitalized interest (5,729) (5,083)  
Other, net 1,216 2,393  
Income and mining tax (expense) benefit (2,355) 669  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (11,365) (9,102)  
Income (loss) from discontinued operations 5,693 550  
Assets, Net [1] 174,430 119,922  
Capital expenditures 253 82  
Gold [Member]      
Financial information relating to reporting segments      
Revenue 106,764 110,474  
Gold [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Revenue 31,600 36,069  
Gold [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Revenue 11,053 14,856  
Gold [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Revenue 40,286 36,300  
Gold [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Revenue 23,825 23,249  
Gold [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Revenue 0 0  
Gold [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Revenue 0 0  
Product, Silver [Member]      
Financial information relating to reporting segments      
Revenue 40,114 52,793  
Product, Silver [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Revenue 21,625 33,968  
Product, Silver [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Revenue 15,317 18,641  
Product, Silver [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Revenue 0 0  
Product, Silver [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Revenue 217 184  
Product, Silver [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Revenue 2,955 0  
Product, Silver [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Revenue 0 0  
Product, Zinc [Member]      
Financial information relating to reporting segments      
Revenue 5,634    
Product, Zinc [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Zinc [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Zinc [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Zinc [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Zinc [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Revenue 5,634    
Product, Zinc [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Lead [Member]      
Financial information relating to reporting segments      
Revenue 2,358    
Product, Lead [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Lead [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Lead [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Lead [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Lead [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Revenue 2,358    
Product, Lead [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Revenue 0    
Product, Metal [Member]      
Financial information relating to reporting segments      
Revenue 154,870 163,267  
Product, Metal [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Revenue 53,225 70,037  
Product, Metal [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Revenue 26,370 33,497  
Product, Metal [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Revenue 40,286 36,300  
Product, Metal [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Revenue 24,042 23,433  
Product, Metal [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Revenue 10,947 0  
Product, Metal [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Revenue 0 0  
Product [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 131,650 99,340  
Product [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 33,244 31,096  
Product [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 22,454 24,305  
Product [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 32,175 28,630  
Product [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 17,392 15,309  
Product [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 26,385 0  
Product [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Costs applicable to sales [2] 0 0  
Mineral, Exploration [Member]      
Financial information relating to reporting segments      
Costs applicable to sales 3,714 6,683  
Mineral, Exploration [Member] | Palmarejo [Member]      
Financial information relating to reporting segments      
Costs applicable to sales 1,010 3,970  
Mineral, Exploration [Member] | Rochester [Member]      
Financial information relating to reporting segments      
Costs applicable to sales 90 33  
Mineral, Exploration [Member] | Kensington [Member]      
Financial information relating to reporting segments      
Costs applicable to sales 481 1,590  
Mineral, Exploration [Member] | Wharf [Member]      
Financial information relating to reporting segments      
Costs applicable to sales 0 10  
Mineral, Exploration [Member] | Silvertip [Member]      
Financial information relating to reporting segments      
Costs applicable to sales 61 0  
Mineral, Exploration [Member] | Other Mining Properties [Member]      
Financial information relating to reporting segments      
Costs applicable to sales $ 2,072 $ 1,080  
[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interest
[2] Excludes amortization.