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SEGMENT AND RELATED INFORMATION: (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total $ 1,471,300us-gaap_RevenueMineralSales $ 1,474,600us-gaap_RevenueMineralSales $ 1,487,400us-gaap_RevenueMineralSales $ 1,354,400us-gaap_RevenueMineralSales $ 1,535,200us-gaap_RevenueMineralSales $ 1,384,500us-gaap_RevenueMineralSales $ 1,410,200us-gaap_RevenueMineralSales $ 1,623,000us-gaap_RevenueMineralSales $ 5,787,694us-gaap_RevenueMineralSales $ 5,952,943us-gaap_RevenueMineralSales $ 6,669,266us-gaap_RevenueMineralSales
Mexico                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 1,708,900us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_MX
1,403,300us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_MX
1,676,400us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_MX
United States                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 1,059,300us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_US
1,031,200us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_US
1,567,400us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_US
Europe                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 892,600us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
1,057,500us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
1,365,100us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Asia                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 933,900us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
907,200us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
763,400us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Brazil                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 372,400us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_BR
471,000us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_BR
449,000us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_BR
Chile                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 401,500us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_CL
366,100us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_CL
443,500us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_CL
Peru                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 282,200us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_PE
324,800us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_PE
296,200us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= country_PE
Other countries                      
Schedule of revenue by geographical location                      
Revenue Mineral Sales, Total                 $ 136,900us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
$ 391,800us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
$ 108,300us-gaap_RevenueMineralSales
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember