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Guarantees and Indemnifications Guarantees (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 2018 Senior Notes [Member] | May 08, 2012 2018 Senior Notes [Member] | Sep. 30, 2012 2017 Convertible Senior Notes [Member]
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Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 227,570 | $ 239,016 | $ 230,000 | $ 200,000 | $ 57,500
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.625% |  | 3.25%
Total of Loans Covered by Guarantees | 6,287 | 53,000 |  |  |
Total of Guaranteed Loans Inquired About | 3,700 | 4,600 |  |  |
Total Loans Indemnified to third parties | 1,020 | 1,400 |  |  |
Loan Repurchase Guarantee Liability | $ 2,475 | $ 2,750 |  |  |

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- Definition The total of all loans indemnified to third party insurers relating to certain repurchase agreements. + References No definition available. + Details
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- Definition Total of loans covered by the guarantees discussed for which inquiries were made by the purchasers of the loans. + References No definition available. + Details
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- Definition The total amount of loans covered by guarantees that said loans could potentially be repurchased in the case certain conditions occur. + References No definition available. + Details
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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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