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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financial information relating to reporting segments                  
Revenue $ 199,469     $ 148,795     $ 516,462 $ 482,049  
Amortization 45,678     31,184     130,758 91,420  
Other operating expenses 14,486     15,850     40,478 40,149  
Loss on debt extinguishments (1,282)     0     (1,282) 0  
Fair value adjustments, net, pretax 4,377     715     8,201 2,907  
Interest expense, net of capitalized interest (5,980)     (5,818)     (19,259) (17,801)  
Other, net (3,634)     (20,903)     (2,931) (19,846)  
Income and mining tax (expense) benefit (218)     (3,785)     13,986 (19,451)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (14,277)     (53,044)     (75,935) (49,423)  
NET INCOME (LOSS) (14,277) $ (36,764) $ (19,201) (53,044) $ 2,930 $ 1,241 (70,242) (48,873)  
Income (loss) from discontinued operations 0     0     5,693 550  
Assets, Net [1] 1,520,442     1,429,100     1,520,442 1,429,100 $ 1,550,671
Capital expenditures 30,678     39,472     78,865 122,982  
Palmarejo [Member]                  
Financial information relating to reporting segments                  
Amortization 15,840     14,794     44,580 45,752  
Other operating expenses 1,327     771     3,798 2,252  
Loss on debt extinguishments             0    
Fair value adjustments, net, pretax 0     0     0 0  
Interest expense, net of capitalized interest (74)     (842)     (322) (1,108)  
Other, net (2,535)     (1,010)     (4,149) (2,399)  
Income and mining tax (expense) benefit (1,630)     (6,461)     (684) (22,550)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 10,926     (3,171)     19,456 18,853  
Income (loss) from discontinued operations 0     0     0 0  
Assets, Net [1] 342,274     368,257     342,274 368,257  
Capital expenditures 7,818     4,686     24,060 23,458  
Rochester [Member]                  
Financial information relating to reporting segments                  
Amortization 4,250     5,294     12,250 14,918  
Other operating expenses 1,210     4,362     3,518 6,149  
Loss on debt extinguishments             0    
Fair value adjustments, net, pretax 0     0     0 0  
Interest expense, net of capitalized interest (287)     (115)     (599) (338)  
Other, net (368)     278     (352) 704  
Income and mining tax (expense) benefit (2,067)     (83)     (2,737) (917)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (8,595)     (1,651)     (15,380) 4,471  
Income (loss) from discontinued operations 0     0     0 0  
Assets, Net [1] 283,229     252,291     283,229 252,291  
Capital expenditures 10,248     3,582     17,665 6,884  
Kensington [Member]                  
Financial information relating to reporting segments                  
Amortization 13,552     6,912     37,816 20,070  
Other operating expenses 281     333     962 981  
Loss on debt extinguishments             0    
Fair value adjustments, net, pretax 0     0     0 0  
Interest expense, net of capitalized interest (453)     (248)     (992) (722)  
Other, net (99)     (34)     (102) (104)  
Income and mining tax (expense) benefit 0     0     0 0  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 7,253     (7,637)     3,400 (15,794)  
Income (loss) from discontinued operations 0     0     0 0  
Assets, Net [1] 204,926     225,161     204,926 225,161  
Capital expenditures 6,359     11,960     19,175 34,032  
Wharf [Member]                  
Financial information relating to reporting segments                  
Amortization 3,301     2,878     8,207 8,888  
Other operating expenses 698     699     2,115 2,052  
Loss on debt extinguishments             0    
Fair value adjustments, net, pretax 0     0     0 0  
Interest expense, net of capitalized interest (26)     (9)     (75) (32)  
Other, net (151)     (422)     174 (379)  
Income and mining tax (expense) benefit (1,672)     (334)     (2,149) (2,009)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 8,657     1,609     13,560 11,287  
Income (loss) from discontinued operations 0     0     0 0  
Assets, Net [1] 99,600     98,978     99,600 98,978  
Capital expenditures 759     1,176     1,361 2,682  
Silvertip [Member]                  
Financial information relating to reporting segments                  
Amortization 8,268     1,073     26,572 1,073  
Other operating expenses 254     148     881 173  
Loss on debt extinguishments             0    
Fair value adjustments, net, pretax 0     0     0 0  
Interest expense, net of capitalized interest (410)     166     (997) (490)  
Other, net (190)     (447)     (411) (25)  
Income and mining tax (expense) benefit 916     4,320     18,256 6,098  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (21,899)     (6,999)     (54,682) (5,586)  
Income (loss) from discontinued operations 0     0     0 0  
Assets, Net [1] 417,678     405,334     417,678 405,334  
Capital expenditures 4,944     17,949     15,456 55,623  
Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Amortization 467     233     1,333 719  
Other operating expenses 10,716     9,537     29,204 28,542  
Loss on debt extinguishments             (1,282)    
Fair value adjustments, net, pretax 4,377     715     8,201 2,907  
Interest expense, net of capitalized interest (4,730)     (4,770)     (16,274) (15,111)  
Other, net (291)     (19,268)     1,909 (17,643)  
Income and mining tax (expense) benefit 4,235     (1,227)     1,300 (73)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (10,619)     (35,195)     (42,289) (62,654)  
Income (loss) from discontinued operations 0     0     5,693 550  
Assets, Net [1] 172,735     79,079     172,735 79,079  
Capital expenditures 550     119     1,148 303  
Gold [Member]                  
Financial information relating to reporting segments                  
Revenue 141,871     103,026     358,961 330,713  
Gold [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Revenue 41,547     32,268     107,063 104,595  
Gold [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Revenue 11,290     17,171     33,538 47,626  
Gold [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Revenue 52,636     29,771     138,083 101,806  
Gold [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Revenue 36,398     23,816     80,277 76,686  
Gold [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Gold [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Silver [Member]                  
Financial information relating to reporting segments                  
Revenue 51,581     43,048     136,658 148,615  
Product, Silver [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Revenue 29,790     23,188     76,821 91,642  
Product, Silver [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Revenue 16,191     18,353     45,765 55,063  
Product, Silver [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Silver [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Revenue 293     177     699 580  
Product, Silver [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Revenue 5,307     1,330     13,373 1,330  
Product, Silver [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Zinc [Member]                  
Financial information relating to reporting segments                  
Revenue 2,046     1,673     10,284 1,673  
Product, Zinc [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Zinc [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Zinc [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Zinc [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Zinc [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Revenue 2,046     1,673     10,284 1,673  
Product, Zinc [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Lead [Member]                  
Financial information relating to reporting segments                  
Revenue 3,971     1,048     10,559 1,048  
Product, Lead [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Lead [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Lead [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Lead [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Lead [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Revenue 3,971     1,048     10,559 1,048  
Product, Lead [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product, Metal [Member]                  
Financial information relating to reporting segments                  
Revenue 199,469     148,795     516,462 482,049  
Product, Metal [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Revenue 71,337     55,456     183,884 196,237  
Product, Metal [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Revenue 27,481     35,524     79,303 102,689  
Product, Metal [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Revenue 52,636     29,771     138,083 101,806  
Product, Metal [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Revenue 36,691     23,993     80,976 77,266  
Product, Metal [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Revenue 11,324     4,051     34,216 4,051  
Product, Metal [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Revenue 0     0     0 0  
Product [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 140,952     116,857     404,550 324,443  
Product [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 37,397     31,554     107,137 92,960  
Product [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 27,749     27,548     74,896 76,304  
Product [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 29,533     28,241     90,841 91,098  
Product [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 22,084     17,979     54,942 52,546  
Product [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 24,189     11,535     76,734 11,535  
Product [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales [2] 0     0     0 0  
Mineral, Exploration [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales 5,893     8,157     15,326 21,269  
Loss on debt extinguishments (1,282)                
Mineral, Exploration [Member] | Palmarejo [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales 1,608     3,195     3,758 10,363  
Mineral, Exploration [Member] | Rochester [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales 145     51     331 296  
Mineral, Exploration [Member] | Kensington [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales 1,465     1,640     3,970 4,625  
Mineral, Exploration [Member] | Wharf [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales 102     63     102 73  
Mineral, Exploration [Member] | Silvertip [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales 828     2,333     1,559 2,439  
Mineral, Exploration [Member] | Other Mining Properties [Member]                  
Financial information relating to reporting segments                  
Costs applicable to sales $ 1,745     $ 875     $ 5,606 $ 3,473  
[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interest
[2] Excludes amortization.