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Debt (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of Debt, Amount | $ 434,400,000 | $ 0 | $ 434,400,000 | $ 0 |
Loss on debt retirements | 23,072,000 | 0 | 23,072,000 | 0 |
Letters of Credit Outstanding, Amount | 171,600,000 |  | 171,600,000 |  | 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 | 59,866,000 |  | 59,866,000 |  | 138,795,000
Unsecured Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | 121,300,000 |  | 121,300,000 |  | 124,600,000
Maximum Borrowing Capacity | 150,000,000 |  | 150,000,000 |  |
Credit facility expiration date |  |  | Sep. 01, 2014 |  |
Letter of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount | 50,300,000 |  | 50,300,000 |  | 54,500,000
Repurchse Agreement [Member] | Financial Services [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum Borrowing Capacity | 150,000,000 |  | 150,000,000 |  |
Credit facility expiration date |  |  | Sep. 27, 2013 |  |
Line of Credit Facility, Initiation Date |  |  | Sep. 28, 2012 |  |
Line of Credit Facility, Amount Outstanding | $ 59,866,000 |  | $ 59,866,000 |  |

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- Definition Days from time of origination of loan to point of sale to third party + References No definition available. + Details
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- Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- 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 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 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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