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Guarantees and Indemnifications Guarantees (Details) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 2018 Senior Notes [Member] | Dec. 31, 2013 2018 Senior Notes [Member] | Mar. 31, 2014 2017 Convertible Senior Notes [Member] | Dec. 31, 2013 2017 Convertible Senior Notes [Member] | Mar. 31, 2014 2018 Convertible Senior Notes [Member] | Dec. 31, 2013 2018 Convertible Senior Notes [Member] | Mar. 31, 2014 Face Value [Member] 2018 Senior Notes [Member] | May 08, 2012 Face Value [Member] 2018 Senior Notes [Member] | Nov. 12, 2010 Face Value [Member] 2018 Senior Notes [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  | $ 228,169,000 | $ 228,070,000 |  |  |  |  | $ 230,000,000 | $ 30,000,000 | $ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.625% |  | 3.25% |  | 3.00% |  |  |  |
Convertible senior subordinated notes |  |  |  |  | 57,500,000 | 57,500,000 | 86,250,000 | 86,250,000 |  |  |
Total of Loans Covered by Guarantees | 6,500,000 | 5,200,000 |  |  |  |  |  |  |  |  |
Total of Guaranteed Loans Inquired About | 7,900,000 | 8,200,000 |  |  |  |  |  |  |  |  |
Total Loans Indemnified to third parties | 1,600,000 | 1,500,000 |  |  |  |  |  |  |  |  |
Loan Repurchase Guarantee Liability | $ 2,800,000 | $ 3,100,000 |  |  |  |  |  |  |  |  |

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- Definition Maximum potential amount of future payments the guarantor could be required to make under the Company's subsidiary loan repurchase guarantees. + References No definition available. + Details
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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 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 Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 + 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 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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