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Notes Payable and Amounts Due Under Repurchase Agreements (2024 Notes Narrative) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |
Shares of common stock issued upon extinguishment of convertible senior notes | 5,489,808 |  |
Repayments of notes payable | $ 234,154,000 | $ 0 | $ 46,251,000
Interest expense on convertible notes | 38,870,000 | 28,479,000 | 31,633,000
Convertible Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense on convertible notes | 26,400,000 | 28,500,000 | 31,600,000
December 2024 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of convertible senior notes payable at issuance | 260,000,000 |  |
Adjustments to additional paid in capital, equity component of convertible debt | 22,900,000 |  |
Deferred income tax liability, equity component of convertible debt | 16,100,000 |  |
Principal amount of convertible senior notes payable, extinguished in exchange for subsequent issuance | 63,600,000 |  |
Repayments of convertible debt | 25,800,000 |  |
Shares of common stock issued upon extinguishment of convertible senior notes | 216,729 |  |
Repayments of notes payable | $ 2,500,000 |  |
Interest rate, effective percentage | 8.50% |  |

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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=26072319&loc=SL6014347-161799 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 65 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7667209&loc=SL6052262-162007 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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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