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Receivables (Summary Of Other Credit Quality Information Regarding Finance Segment Secured Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts and Notes Receivable, Net [Abstract]      
Total secured loans $ 644,441bid_TotalSecuredLoans $ 474,433bid_TotalSecuredLoans  
Loans past due 22,409us-gaap_FinancingReceivableRecordedInvestmentPastDue 24,129us-gaap_FinancingReceivableRecordedInvestmentPastDue  
Loans more than 90 days past due 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 1,266us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing  
Non-accrual loans 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest 0us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest  
Impaired loan 0us-gaap_ImpairedFinancingReceivableRecordedInvestment 0us-gaap_ImpairedFinancingReceivableRecordedInvestment  
Allowance for credit losses - impaired loans 0us-gaap_ImpairedFinancingReceivableRelatedAllowance 0us-gaap_ImpairedFinancingReceivableRelatedAllowance  
Allowance for credit losses based on historical data 1,166bid_LoansAndLeasesReceivableImpairedAllowanceForLoanLossesBasedOnHistoricalData 1,746bid_LoansAndLeasesReceivableImpairedAllowanceForLoanLossesBasedOnHistoricalData  
Total Allowance for Credit Losses - secured loans $ 1,166us-gaap_LoansAndLeasesReceivableAllowance $ 1,746us-gaap_LoansAndLeasesReceivableAllowance $ 1,341us-gaap_LoansAndLeasesReceivableAllowance