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Notes Payable and Amounts Due Under Repurchase Agreements Notes Payable and Amounts Due Under Repurchase Agreements (2029 Notes Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Convertible Debt [Member] | Dec. 31, 2012 Convertible Debt [Member] | Dec. 31, 2011 Convertible Debt [Member] | Feb. 10, 2014 December 2029 Notes [Member] | Dec. 31, 2013 December 2029 Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  | 5.25%
Principal amount of convertible senior notes payable at issuance |  |  |  |  |  |  |  | $ 115,800,000
Adjustments to additional paid in capital, equity component of convertible debt |  |  |  |  |  |  |  | 15,600,000
Deferred income tax liability, equity component of convertible debt |  |  |  |  |  |  |  | 11,000,000
Principal amount of convertible senior notes payable at issuance, issued for cash |  |  |  |  |  |  |  | 52,200,000
Principal amount of convertible senior notes payable at issuance, issued in exchange of debt outstanding |  |  |  |  |  |  |  | 63,600,000
Debt instrument, interest payment period |  |  |  |  |  |  |  | 6 months
Convertible senior notes, contingent interest rate |  |  |  |  |  |  |  | 0.50%
Debt instrument, number of days to measure stock value against conversion value |  |  |  |  |  |  |  | 20 days
Debt instrument, consecutive trading day period to determine convertibility |  |  |  |  |  |  |  | 30 days
Stock price must exceed conversion price to allow conversion |  |  |  |  |  |  |  | 120.00%
Debt instrument, convertible, conversion price |  |  |  |  |  |  |  | $ 9.57
Debt instrument, convertible, number of equity instruments, shares |  |  |  |  |  |  |  | 104.5
Debt instrument, face amount |  |  |  |  |  |  |  | 1,000
Debt instrument, number of days of average closing stock price used in conversion value calculation |  |  |  |  |  |  |  | 10 days
Debt instrument, number of consecutive trading days used to calculate average closing stock price for the conversion value |  |  |  |  |  |  |  | 10 days
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  | 100.00%
Extinguishment of debt, amount |  |  |  |  |  |  | 22,700,000 | 47,500,000
Extinguishment of debt, cash paid | 168,700,000 |  |  |  |  |  |  | 74,800,000
Extinguishment of debt, cash paid for shares of common stock |  |  |  |  |  |  |  | 34,900,000
Extinguishment of debt, shares issued |  |  |  |  |  |  | 946,793 | 1,629,677
Extinguishment of debt, carrying value at extinguishment |  |  |  |  |  |  | 21,600,000 | 44,500,000
Extinguishment of debt, gain (loss), net of tax |  |  |  |  |  |  | (1,700,000) | (5,200,000)
Interest rate, effective percentage |  |  |  |  |  |  |  | 11.90%
Interest expense on convertible notes | $ 38,870,000 | $ 28,479,000 | $ 31,633,000 | $ 26,400,000 | $ 28,500,000 | $ 31,600,000 |  |

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- Definition The additional interest paid on convertible senior notes outstanding under certain conditions based on the average trading price of the notes during a specified period. + References No definition available. + Details
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- Definition The number of consecutive trading days ending on the last trading day of the immediately preceding calendar quarter in which 20 trading days of which our last reported price of common stock is greater than or equal to 130% of the conversion price of convertible debt. + References No definition available. + Details
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- Definition The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity. + References No definition available. + Details
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- Definition The number of consecutive trading days used to calculate the average closing stock price for the conversion value. + References No definition available. + Details
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- Definition Number of trading days that the last reported price of our common stock during the period of a set number of consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to a certain percentage of the applicable conversion price on each applicable trading day to determine convertibility of notes. + References No definition available. + Details
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- Definition The amount that the last reported price of the common stock for at least a certain number of trading days must be greater than or equal to the conversion price on each applicable trading day. + References No definition available. + Details
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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 Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6401765&loc=d3e13305-112630 + Details
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