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Segment Reporting (Details 1) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Assets                
Cash and cash equivalents $ 142,915,000 $ 207,882,000 $ 142,915,000 $ 207,882,000 $ 199,397,000 $ 175,012,000 $ 106,830,000 $ 66,118,000
Short term investments 657,000   657,000     20,254,000    
Other assets 123,876,000   123,876,000     106,045,000    
Sales Revenue, Goods, Net 230,593,000 343,575,000 689,563,000 774,289,000        
Cost of Goods Sold (124,967,000) (141,253,000) (349,344,000) (310,829,000)        
Depreciation, depletion and amortization (52,844,000) (58,652,000) (166,460,000) (166,334,000)        
Gross Profit 52,782,000 143,670,000 173,759,000 297,126,000        
Costs of Metals Sold 6,957,000 4,772,000 19,829,000 11,611,000        
Loss on impairment 1,293,000 0 6,106,000 0        
Operating Income (Loss) 33,989,000 127,391,000 119,750,000 245,272,000        
Interest and other income 12,664,000 (6,610,000) 14,450,000 (1,946,000)        
Interest expense (7,351,000) (7,980,000) (21,578,000) (26,553,000)        
Gains (Losses) on Extinguishment of Debt 0 (784,000) 0 (1,640,000)        
Gain (Loss) on Derivative Instruments, Net, Pretax (37,648,000) (53,351,000) (44,722,000) (71,051,000)        
Income tax benefit (expense) (17,475,000) (27,606,000) (56,773,000) (61,947,000)        
Net Income (Loss) Attributable to Parent (15,821,000) 31,060,000 11,127,000 82,135,000        
Assets 3,180,440,000   3,180,440,000     3,264,441,000    
Payments to Acquire Productive Assets 29,972,000 38,099,000 93,857,000 79,780,000        
Palmarejo [Member]
                
Assets                
Sales Revenue, Goods, Net 102,642,000 166,875,000 362,729,000 378,767,000        
Cost of Goods Sold (48,672,000) (64,112,000) (157,070,000) (139,251,000)        
Depreciation, depletion and amortization (34,007,000) (41,182,000) (114,525,000) (116,610,000)        
Gross Profit 19,963,000 61,581,000 91,134,000 122,906,000        
Costs of Metals Sold 2,288,000 2,200,000 5,232,000 4,112,000        
Loss on impairment     0          
Other General Expense 0 225,000 0 225,000        
Operating Income (Loss) 17,675,000 59,156,000 85,902,000 118,569,000        
Interest and other income 4,914,000 (6,278,000) 4,774,000 (4,450,000)        
Interest expense (4,401,000) (5,270,000) (14,883,000) (17,085,000)        
Gains (Losses) on Extinguishment of Debt   0   0        
Gain (Loss) on Derivative Instruments, Net, Pretax (34,266,000) (26,464,000) (45,771,000) (46,505,000)        
Income tax benefit (expense) 5,495,000 (2,459,000) (10,015,000) (12,521,000)        
Net Income (Loss) Attributable to Parent (10,583,000) 18,685,000 20,007,000 38,008,000        
Assets 1,926,695,000 [1] 2,050,108,000 [1] 1,926,695,000 [1] 2,050,108,000 [1]        
Payments to Acquire Productive Assets 11,321,000 [2] 9,528,000 [2] 29,665,000 [2] 24,887,000 [2]        
Reportable Segment [Member]
                
Assets                
Total assets for reportable segments 2,912,992,000   2,912,992,000     2,963,130,000    
Sales Revenue, Goods, Net 230,593,000 343,575,000 689,563,000 774,289,000        
Cost of Goods Sold (124,967,000) (141,253,000) (349,344,000) (310,829,000)        
Depreciation, depletion and amortization (52,844,000) (58,652,000) (166,460,000) (166,334,000)        
Gross Profit 52,782,000 143,670,000 173,759,000 297,126,000        
Costs of Metals Sold 6,957,000 4,772,000 19,829,000 11,611,000        
Loss on impairment 1,293,000   6,106,000          
Other General Expense 10,543,000 11,507,000 28,074,000 40,243,000        
Operating Income (Loss) 33,989,000 127,391,000 119,750,000 245,272,000        
Interest and other income 12,664,000 (6,610,000) 14,450,000 (1,946,000)        
Interest expense (7,351,000) (7,980,000) (21,578,000) (26,553,000)        
Gains (Losses) on Extinguishment of Debt   (784,000)   (1,640,000)        
Gain (Loss) on Derivative Instruments, Net, Pretax (37,648,000) (53,351,000) (44,722,000) (71,051,000)        
Income tax benefit (expense) (17,475,000) (27,606,000) (56,773,000) (61,947,000)        
Net Income (Loss) Attributable to Parent (15,821,000) 31,060,000 11,127,000 82,135,000        
Assets 2,912,992,000 [1] 2,961,441,000 [1] 2,912,992,000 [1] 2,961,441,000 [1]        
Payments to Acquire Productive Assets 29,972,000 [2] 38,099,000 [2] 93,857,000 [2] 79,780,000 [2]        
San Bartolome [Member]
                
Assets                
Sales Revenue, Goods, Net 46,192,000 102,820,000 140,951,000 204,739,000        
Cost of Goods Sold (19,937,000) (30,085,000) (56,317,000) (58,329,000)        
Depreciation, depletion and amortization (4,163,000) (6,067,000) (12,452,000) (16,392,000)        
Gross Profit 22,092,000 66,668,000 72,182,000 130,018,000        
Costs of Metals Sold 50,000 61,000 51,000 96,000        
Loss on impairment     0          
Other General Expense 50,000 111,000 80,000 219,000        
Operating Income (Loss) 21,992,000 66,496,000 72,051,000 129,703,000        
Interest and other income 8,353,000 (227,000) 9,079,000 560,000        
Interest expense (11,000) (9,000) (47,000) (45,000)        
Gains (Losses) on Extinguishment of Debt   0   0        
Gain (Loss) on Derivative Instruments, Net, Pretax 0 0 0 0        
Income tax benefit (expense) (23,106,000) (25,063,000) (41,684,000) (47,209,000)        
Net Income (Loss) Attributable to Parent 7,228,000 41,197,000 39,399,000 83,009,000        
Assets 299,041,000 [1] 265,488,000 [1] 299,041,000 [1] 265,488,000 [1]        
Payments to Acquire Productive Assets 4,406,000 [2] 4,418,000 [2] 22,413,000 [2] 11,230,000 [2]        
Kensington [Member]
                
Assets                
Sales Revenue, Goods, Net 36,450,000 44,185,000 67,950,000 118,307,000        
Cost of Goods Sold (26,881,000) (24,347,000) (60,078,000) (70,111,000)        
Depreciation, depletion and amortization (11,512,000) (9,567,000) (27,836,000) (28,822,000)        
Gross Profit (1,943,000) 10,271,000 (19,964,000) 19,374,000        
Costs of Metals Sold 1,476,000 308,000 1,971,000 674,000        
Loss on impairment     0          
Other General Expense 39,000 88,000 75,000 224,000        
Operating Income (Loss) (3,458,000) 9,875,000 (22,010,000) 18,476,000        
Interest and other income 0 1,000 1,000 4,000        
Interest expense (1,834,000) (1,115,000) (3,627,000) (3,722,000)        
Gains (Losses) on Extinguishment of Debt   0   0        
Gain (Loss) on Derivative Instruments, Net, Pretax (4,283,000) (22,244,000) (2,647,000) (20,568,000)        
Income tax benefit (expense) 0 (1,000) 0 (21,000)        
Net Income (Loss) Attributable to Parent (9,575,000) (13,484,000) (28,283,000) (5,831,000)        
Assets 520,619,000 [1] 515,335,000 [1] 520,619,000 [1] 515,335,000 [1]        
Payments to Acquire Productive Assets 9,034,000 [2] 9,230,000 [2] 29,235,000 [2] 21,964,000 [2]        
Rochester [Member]
                
Assets                
Sales Revenue, Goods, Net 36,244,000 17,453,000 89,156,000 46,149,000        
Cost of Goods Sold (21,014,000) (11,356,000) (51,331,000) (24,054,000)        
Depreciation, depletion and amortization (2,061,000) (573,000) (5,763,000) (1,671,000)        
Gross Profit 13,169,000 5,524,000 32,062,000 20,424,000        
Costs of Metals Sold 1,158,000 242,000 3,003,000 604,000        
Loss on impairment     0          
Other General Expense 1,109,000 3,158,000 3,142,000 17,719,000        
Operating Income (Loss) 10,902,000 2,124,000 25,917,000 2,101,000        
Interest and other income 59,000 7,000 347,000 58,000        
Interest expense (6,000) (14,000) (21,000) (14,000)        
Gains (Losses) on Extinguishment of Debt   0   0        
Gain (Loss) on Derivative Instruments, Net, Pretax 0 0 0 0        
Income tax benefit (expense) 0 0 0 0        
Net Income (Loss) Attributable to Parent 10,955,000 2,117,000 26,243,000 2,145,000        
Assets 104,066,000 [1] 55,734,000 [1] 104,066,000 [1] 55,734,000 [1]        
Payments to Acquire Productive Assets 4,777,000 [2] 13,559,000 [2] 10,362,000 [2] 19,428,000 [2]        
Martha [Member]
                
Assets                
Sales Revenue, Goods, Net 4,933,000 6,037,000 12,700,000 10,492,000        
Cost of Goods Sold (6,481,000) (8,143,000) (17,276,000) (11,502,000)        
Depreciation, depletion and amortization (32,000) (237,000) (1,332,000) (82,000)        
Gross Profit (1,580,000) (2,343,000) (5,908,000) (1,092,000)        
Costs of Metals Sold 1,217,000 1,477,000 7,391,000 4,300,000        
Loss on impairment 1,293,000   6,106,000          
Other General Expense 133,000 150,000 411,000 150,000        
Operating Income (Loss) (4,223,000) (3,970,000) (19,816,000) (5,542,000)        
Interest and other income (342,000) (99,000) (912,000) (588,000)        
Interest expense (2,000) (35,000) (3,000) (448,000)        
Gains (Losses) on Extinguishment of Debt   0   0        
Gain (Loss) on Derivative Instruments, Net, Pretax 0 0 0 0        
Income tax benefit (expense) 1,233,000 (173,000) 993,000 (542,000)        
Net Income (Loss) Attributable to Parent (3,334,000) (4,277,000) (19,738,000) (7,120,000)        
Assets 11,339,000 [1] 19,537,000 [1] 11,339,000 [1] 19,537,000 [1]        
Payments to Acquire Productive Assets 6,000 [2] 1,130,000 [2] 1,194,000 [2] 1,954,000 [2]        
Endeavor [Member]
                
Assets                
Sales Revenue, Goods, Net 4,132,000 6,205,000 16,077,000 15,835,000        
Cost of Goods Sold (1,982,000) (3,210,000) (7,272,000) (7,582,000)        
Depreciation, depletion and amortization (898,000) (914,000) (4,134,000) (2,398,000)        
Gross Profit 1,252,000 2,081,000 4,671,000 5,855,000        
Costs of Metals Sold 0 0 0 0        
Loss on impairment     0          
Other General Expense 0 (1,000) 0 (1,000)        
Operating Income (Loss) 1,252,000 2,082,000 4,671,000 5,856,000        
Interest and other income 0 0 0 0        
Interest expense 0 0 0 0        
Gains (Losses) on Extinguishment of Debt   0   0        
Gain (Loss) on Derivative Instruments, Net, Pretax 0 0 0 0        
Income tax benefit (expense) (202,000) 107,000 (202,000) 104,000        
Net Income (Loss) Attributable to Parent 1,050,000 2,189,000 4,469,000 5,960,000        
Assets 32,619,000 [1] 37,546,000 [1] 32,619,000 [1] 37,546,000 [1]        
Payments to Acquire Productive Assets 0 [2] 0 [2] 0 [2] 0 [2]        
Other Mining Properties [Member]
                
Assets                
Sales Revenue, Goods, Net 0 0 0 0        
Cost of Goods Sold 0 0 0 0        
Depreciation, depletion and amortization (171,000) (112,000) (418,000) (359,000)        
Gross Profit (171,000) (112,000) (418,000) (359,000)        
Costs of Metals Sold 768,000 484,000 2,181,000 1,825,000        
Loss on impairment     0          
Other General Expense 9,212,000 7,776,000 24,366,000 21,707,000        
Operating Income (Loss) (10,151,000) (8,372,000) (26,965,000) (23,891,000)        
Interest and other income (320,000) (14,000) 1,161,000 2,470,000        
Interest expense (1,097,000) (1,537,000) (2,997,000) (5,239,000)        
Gains (Losses) on Extinguishment of Debt   (784,000)   (1,640,000)        
Gain (Loss) on Derivative Instruments, Net, Pretax 901,000 (4,643,000) 3,696,000 (3,978,000)        
Income tax benefit (expense) (895,000) (17,000) (5,865,000) (1,758,000)        
Net Income (Loss) Attributable to Parent (11,562,000) (15,367,000) (30,970,000) (34,036,000)        
Assets 18,613,000 [1] 17,693,000 [1] 18,613,000 [1] 17,693,000 [1]        
Payments to Acquire Productive Assets $ 428,000 [2] $ 234,000 [2] $ 988,000 [2] $ 317,000 [2]        
[1] Segment assets consist of receivables, prepaids, inventories, property, plant and equipment, and mining properties
[2] Balance represents cash flow amounts