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Interest Rate Swaps (Details) (Interest Rate Swap Agreements, USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Fair Value, Inputs, Level 2 | Dec. 31, 2012 Fair Value, Inputs, Level 2 | Jun. 30, 2013 Floating Rate Floor Plan Debt | Jun. 30, 2013 Floating Rate Floor Plan Debt | Jun. 30, 2013 Floating Rate Floor Plan Debt LIBOR portion | Jun. 30, 2013 Floating Rate Floor Plan Debt Fixed rate portion
Derivative |  |  |  |  |  |  |  |
Portion of floating rate floor plan debt fixed by swap agreements |  |  |  |  |  |  | $ 300,000 | $ 100,000
Interest rate swap, fixed (as a percent) |  |  |  |  |  |  | 2.135% | 1.55%
Estimated liabilities of swaps designated as hedging instruments, fair value |  |  | 10,743 | 14,337 |  |  |  |
Hedge ineffectiveness recorded | $ 0 | $ 0 |  |  |  |  |  |
Increase in the weighted average interest rate on floor plan borrowings due to the swaps (as a percent) |  |  |  |  | 0.35% | 0.37% |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Represents the impact on the weighted average interest rate from interest rate swaps for the period. + References No definition available. + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Gain recognized in earnings during the reporting period representing the amount of the fair value hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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