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SEGMENT AND RELATED INFORMATION: - Financial (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
country
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financial information related to segments                      
Number of reportable segments | segment                 3    
Number of countries having open-pit operations | country                 2    
Financial information relating to segments                      
Net sales outside of segments                 $ 6,654,500 $ 5,379,800 $ 5,045,900
Cost of sales (exclusive of depreciation, amortization and depletion)                 3,252,800 3,034,100 2,927,600
Selling, general and administrative                 93,100 94,300 99,400
Depreciation, amortization and depletion                 671,100 647,100 510,700
Exploration                 28,800 40,100 48,800
Environmental remediation                 (10,200)   45,000
Operating income $ 830,000 $ 692,600 $ 525,900 $ 570,400 $ 470,500 $ 362,400 $ 385,100 $ 346,200 2,618,900 1,564,200 1,414,400
Interest, net                 (300,500) (283,600) (199,900)
Other income (expense)                 (15,700) (24,600) (25,300)
Income taxes                 (1,593,400) (501,100) (464,900)
Equity earnings of affiliate                 23,100 23,900 16,800
Non-controlling interest                 (3,900) (2,300) (4,700)
Net income attributable to SCC (287,400) $ 401,800 $ 299,700 $ 314,400 171,900 $ 197,600 $ 221,900 $ 185,100 728,500 776,500 736,400
Capital investment                 1,023,500 1,118,500 1,250,000
Property and mine development, net 9,099,600       8,766,500       9,099,600 8,766,500 8,262,800
Total assets 13,780,100       13,234,300       13,780,100 13,234,300 12,593,200
Payment to acquire business, net of cash acquired                     100,400
Intersegment sales                      
Financial information relating to segments                      
Net sales outside of segments                 (71,000)    
Corporate, other and eliminations                      
Financial information relating to segments                      
Net sales outside of segments                   (72,000) (67,600)
Cost of sales (exclusive of depreciation, amortization and depletion)                 (69,600) (73,400) (75,200)
Selling, general and administrative                 1,100 2,300 1,100
Depreciation, amortization and depletion                 10,300 15,500 (17,200)
Exploration                 6,200 16,900 19,500
Operating income                 (19,000) (33,300) 4,200
Capital investment                 4,000 4,700 105,100
Property and mine development, net 338,400       231,700       338,400 231,700 404,200
Total assets 253,400       9,600       $ 253,400 9,600 383,300
Mexican Open-pit                      
Financial information related to segments                      
Number of open-pit copper mines | item                 2    
Mexican Open-pit | Operating segment                      
Financial information relating to segments                      
Net sales outside of segments                 $ 3,972,700 3,234,300 2,703,900
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,594,300 1,523,200 1,390,000
Selling, general and administrative                 47,900 47,100 50,500
Depreciation, amortization and depletion                 401,000 364,700 265,000
Exploration                 2,700 5,200 7,800
Environmental remediation                 (10,200)   45,000
Operating income                 1,937,000 1,294,100 945,600
Capital investment                 297,600 537,000 820,500
Property and mine development, net 5,004,500       5,136,800       5,004,500 5,136,800 4,879,300
Total assets 8,323,100       8,174,400       $ 8,323,100 8,174,400 7,459,800
Mexican IMMSA Unit                      
Financial information related to segments                      
Number of underground poly metal mines | item                 5    
Mexican IMMSA Unit | Operating segment                      
Financial information relating to segments                      
Net sales outside of segments                 $ 437,700 351,100 320,700
Cost of sales (exclusive of depreciation, amortization and depletion)                 365,300 304,100 323,800
Selling, general and administrative                 7,900 7,400 6,400
Depreciation, amortization and depletion                 56,200 49,800 34,800
Exploration                 5,500 5,000 9,600
Operating income                 73,800 56,800 13,700
Capital investment                 36,500 35,800 39,200
Property and mine development, net 366,900       448,700       366,900 448,700 395,800
Total assets 889,100       825,000       889,100 825,000 787,500
Mexican IMMSA Unit | Intersegment sales                      
Financial information relating to segments                      
Net sales outside of segments                 $ 71,000 72,000 67,600
Peruvian Operations                      
Financial information related to segments                      
Number of open-pit copper mines | item                 2    
Peruvian Operations | Operating segment                      
Financial information relating to segments                      
Net sales outside of segments                 $ 2,244,100 1,794,400 2,021,300
Cost of sales (exclusive of depreciation, amortization and depletion)                 1,362,800 1,280,200 1,289,000
Selling, general and administrative                 36,200 37,500 41,400
Depreciation, amortization and depletion                 203,600 217,100 228,100
Exploration                 14,400 13,000 11,900
Operating income                 627,100 246,600 450,900
Capital investment                 685,400 541,000 285,200
Property and mine development, net 3,389,800       2,949,300       3,389,800 2,949,300 2,583,500
Total assets $ 4,314,500       $ 4,225,300       $ 4,314,500 $ 4,225,300 3,962,600
El Pilar | Corporate, other and eliminations                      
Financial information relating to segments                      
Payment to acquire business, net of cash acquired                     $ 100,400