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Debt (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Extinguishment of Debt, Amount | $ 0 |
Letters of Credit Outstanding, Amount | 172,700,000 | 179,200,000
Days from time of origination of loan to point of sale to third party | 30 days |
Line of Credit Facility, Amount Outstanding | 56,631,000 | 138,795,000
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Letters of Credit Outstanding, Amount | 122,700,000 | 124,600,000
Credit facility expiration date | Sep. 01, 2014 |
Maximum Borrowing Capacity | 150,000,000 |
Letter of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Letters of Credit Outstanding, Amount | 50,000,000 | 54,500,000
Repurchse Agreement [Member] | Financial Services [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility expiration date | Sep. 27, 2013 |
Maximum Borrowing Capacity | 150,000,000 |
Line of Credit Facility, Initiation Date | Sep. 28, 2012 |
Line of Credit Facility, Amount Outstanding | 56,600,000 |
Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Subsequent Event, Date | Apr. 24, 2013 |
Gains (Losses) on Extinguishment of Debt | 18,000,000 |
Amount of Tender Offer to Buyback Senior Notes | $ 398,900,000 |

X
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X
- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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