XML 84 R58.htm IDEA: XBRL DOCUMENT v2.4.0.6
Commitments and Contingencies Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
oz
Dec. 31, 2011
Dec. 31, 2012
Minimum
Dec. 31, 2012
Maximum
Dec. 31, 2012
Variable Interest Entity, Not Primary Beneficiary
Guarantor Obligations [Line Items]          
Operating leases term     3 years 5 years  
Extensions of credit made by the Independent Lender to credit services customers amount range     $ 50 $ 1,500  
Extensions of credit made by the Independent Lender to credit services customers terms     7 days 35 days  
Extensions of credit made by the Independent Lender to credit services customers rate 10.00%        
Net loans as a percentage of variable interest entity's total assets, maximum         50.00%
Letter of Credit expires after due date of the extension of credit 30 days        
Maximum loss exposure under outstanding letters of credit $ 17,464,000 $ 16,564,000      
Forward sales commitments silver (ounces) 36,000        
Forward sales commitments gold (ounces) 6,000