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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial information relating to reporting segments                      
Revenue $ 143,855 $ 148,795 $ 169,987 $ 163,267 $ 214,585 $ 159,919 $ 149,540 $ 185,554 $ 625,904 $ 709,598 $ 571,897
Amortization 37,053 31,184 29,459 30,777 44,722 32,401 30,733 38,693 128,473 146,549 116,528
Impairment of Long-Lived Assets Held-for-use                 0 0 4,446
Other operating expenses                 51,388 52,552 43,686
Loss on debt extinguishments                 0 (9,342) (21,365)
Fair value adjustments, net, pretax                 3,638 (864) (11,581)
Interest expense, net of capitalized interest                 (24,364) (16,440) (36,896)
Other, net                 (24,705) 26,643 98
Income and mining tax (expense) benefit                 16,780 (28,998) 33,247
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 468 (53,044) 2,930 691 14,349 (11,728) (9,995) 18,299 (48,955) 10,925 22,435
Income (loss) from discontinued operations 0 0 0 550 (6,724) (4,924) (960) 364 550 (12,244) 32,917
Assets, Net [1] 1,550,671       1,344,553       1,550,671 1,344,553 1,045,722
Capital expenditures 17,805 39,472 41,165 42,345 47,054 28,982 37,107 23,591 140,787 136,734 94,382
Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                     141,273
Amortization                 60,744 73,744 36,599
Impairment of Long-Lived Assets Held-for-use                     0
Other operating expenses                 3,043 1,263 1,213
Loss on debt extinguishments                   0 0
Fair value adjustments, net, pretax                 0 0 (5,814)
Interest expense, net of capitalized interest                 (2,137) (487) (1,187)
Other, net                 (8,308) (851) (12,125)
Income and mining tax (expense) benefit                 (15,724) (24,330) 45,085
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 25,196 16,034 43,537
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 363,024       377,621       363,024 377,621 436,642
Capital expenditures                 29,425 29,902 35,810
Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                     139,945
Amortization                 20,909 22,306 21,838
Impairment of Long-Lived Assets Held-for-use                     0
Other operating expenses                 7,071 3,394 2,801
Loss on debt extinguishments                   0 0
Fair value adjustments, net, pretax                 0 (864) (4,133)
Interest expense, net of capitalized interest                 (466) (496) (664)
Other, net                 (1,211) 2,193 (3,859)
Income and mining tax (expense) benefit                 (874) (1,028) (2,785)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 5,268 17,512 13,298
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 269,903       239,223       269,903 239,223 219,009
Capital expenditures                 9,919 40,874 16,446
Kensington [Member]                      
Financial information relating to reporting segments                      
Revenue                     146,593
Amortization                 29,508 36,022 34,787
Impairment of Long-Lived Assets Held-for-use                     0
Other operating expenses                 1,721 1,412 1,038
Loss on debt extinguishments                   0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (973) (413) (128)
Other, net                 2,795 (922) (25)
Income and mining tax (expense) benefit                 0 0 0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (14,718) (9,000) 10,397
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 224,460       212,588       224,460 212,588 199,232
Capital expenditures                 44,738 36,248 36,826
Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                     136,678
Amortization                 11,072 13,012 20,621
Impairment of Long-Lived Assets Held-for-use                     0
Other operating expenses                 2,686 2,468 2,238
Loss on debt extinguishments                   0 0
Fair value adjustments, net, pretax                 0 0 0
Interest expense, net of capitalized interest                 (40) (66) (69)
Other, net                 (834) 172 17
Income and mining tax (expense) benefit                 (1,063) (3,936) (4,293)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 13,516 36,949 43,093
Income (loss) from discontinued operations                 0 0 0
Assets, Net [1] 102,246       104,010       102,246 104,010 105,901
Capital expenditures                 3,382 8,844 4,812
Silvertip [Member]                      
Financial information relating to reporting segments                      
Amortization                 5,235 0  
Other operating expenses                 303 153  
Loss on debt extinguishments                   0  
Fair value adjustments, net, pretax                 0 0  
Interest expense, net of capitalized interest                 (766) (2,212)  
Other, net                 (370) 1,142  
Income and mining tax (expense) benefit                 16,057 (932)  
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (20,085) (2,155)  
Income (loss) from discontinued operations                 0 0  
Assets, Net [1] 415,998       339,369       415,998 339,369  
Capital expenditures                 52,932 17,684  
Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                     7,408
Amortization                 1,005 1,465 2,683
Impairment of Long-Lived Assets Held-for-use                     4,446
Other operating expenses                 36,564 44,015 36,396
Loss on debt extinguishments                   (9,342) (21,365)
Fair value adjustments, net, pretax                 3,638 0 (1,634)
Interest expense, net of capitalized interest                 (19,982) (14,978) (34,848)
Other, net                 (16,777) 26,051 16,090
Income and mining tax (expense) benefit                 18,384 296 (4,760)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 (58,132) (50,570) (87,890)
Income (loss) from discontinued operations                 550 (12,244) 32,917
Assets, Net [1] 175,040       411,111       175,040 411,111 84,938
Capital expenditures                 391 20,866 488
Gold [Member]                      
Financial information relating to reporting segments                      
Revenue                 427,008 494,249 415,990
Gold [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 131,758 146,187 72,612
Gold [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 66,556 68,964 61,724
Gold [Member] | Kensington [Member]                      
Financial information relating to reporting segments                      
Revenue                 132,924 154,469 146,593
Gold [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 95,770 124,629 135,061
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 0
Product, Silver [Member]                      
Financial information relating to reporting segments                      
Revenue                 193,153 215,349 152,627
Product, Silver [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 113,998 128,622 68,661
Product, Silver [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 75,252 83,716 78,221
Product, Silver [Member] | Kensington [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 0 0
Product, Silver [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 746 1,272 1,617
Product, Silver [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 3,157 0  
Product, Silver [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 1,739 4,128
Product, Zinc [Member]                      
Financial information relating to reporting segments                      
Revenue                 3,612    
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                 3,612    
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                 2,131    
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                 2,131    
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                 625,904 709,598 568,617
Product, Metal [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Revenue                 245,756 274,809 141,273
Product, Metal [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Revenue                 141,808 152,680 139,945
Product, Metal [Member] | Kensington [Member]                      
Financial information relating to reporting segments                      
Revenue                 132,924 154,469 146,593
Product, Metal [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Revenue                 96,516 125,901 136,678
Product, Metal [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Revenue                 8,900 0  
Product, Metal [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Revenue                 0 1,739 4,128
Royalty [Member]                      
Financial information relating to reporting segments                      
Royalty Income, Nonoperating                     3,280
Royalty [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Royalty Income, Nonoperating                     0
Royalty [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Royalty Income, Nonoperating                     0
Royalty [Member] | Kensington [Member]                      
Financial information relating to reporting segments                      
Royalty Income, Nonoperating                     0
Royalty [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Royalty Income, Nonoperating                     0
Royalty [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Royalty Income, Nonoperating                     3,280
Product [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2] 116,507 116,857 108,246 99,340 121,982 101,559 102,229 114,490 440,950 440,260 335,375
Product [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 120,088 146,176 80,820
Product [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 105,677 107,921 89,726
Product [Member] | Kensington [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 112,364 116,096 96,731
Product [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 67,201 69,322 66,379
Product [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 35,620 0  
Product [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales [2]                 0 745 1,719
Mineral, Exploration [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales $ 4,128 $ 8,157 $ 6,429 $ 6,683 $ 7,454 $ 9,792 $ 7,813 $ 5,252 25,397 30,311 12,930
Mineral, Exploration [Member] | Palmarejo [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 10,516 11,924 5,063
Mineral, Exploration [Member] | Rochester [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 332 1,352 841
Mineral, Exploration [Member] | Kensington [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 5,871 8,604 3,487
Mineral, Exploration [Member] | Wharf [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 104 320 2
Mineral, Exploration [Member] | Silvertip [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 2,748 0  
Mineral, Exploration [Member] | Other Mining Properties [Member]                      
Financial information relating to reporting segments                      
Costs applicable to sales                 $ 5,826 $ 8,111 $ 3,537
[1] Segment assets include receivables, prepaids, inventories, property, plant and equipment, and mineral interest
[2] Excludes amortization.