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Notes Payable and Amounts Due Under Repurchase Agreements (2015 Notes, 2015 Notes Hedges and 2015 Warrants Narrative) (Details) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended |
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Dec. 31, 2013 counterparties | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Convertible Debt [Member] | Dec. 31, 2012 Convertible Debt [Member] | Dec. 31, 2011 Convertible Debt [Member] | Dec. 31, 2013 2015 Notes Embedded Derivative [Member] | Dec. 31, 2012 2015 Notes Embedded Derivative [Member] | Dec. 31, 2013 2015 Notes Hedges [Member] | Sep. 30, 2010 2015 Notes Hedges [Member] | Dec. 31, 2013 September 2015 Notes [Member] | Dec. 31, 2012 September 2015 Notes [Member] | Dec. 31, 2010 September 2015 Notes [Member] | Sep. 30, 2010 September 2015 Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |
Principal amount of convertible senior notes payable at issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000
Deferred financing costs |  |  |  |  |  |  |  |  |  |  | 6,800,000 |  |  |
Debt instrument, number of days holders may convert |  |  |  |  |  |  |  |  |  |  | 5 days |  |  |
Debt instrument, measurement period of convertible senior notes |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |
Product of last reported common stock sale price and conversion rate |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |
Debt instrument, convertible, number of equity instruments, shares |  |  |  |  |  |  |  |  |  |  |  | 80.9486 | 80 |
Debt instrument, convertible, conversion price |  |  |  |  |  |  |  |  |  |  |  | $ 12.35 | $ 12.50 |
Debt instrument, convertible, fundamental change stock price floor |  |  |  |  |  |  |  |  |  |  | 10.00 |  |  |
Debt instrument, convertible, conversion rate increase upon fundamental change |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Derivative, liability, fair value at issuance |  |  |  |  |  |  | 37,000,000 |  |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  |  | 107,000,000 | 43,100,000 |  |  |  |  |  |
Conversion spread, shares of common stock |  |  |  |  |  |  |  |  | 7,474,817 | 16,000,000 |  |  |  |
Derivative asset, strike price |  |  |  |  |  |  |  |  | $ 12.35 | $ 12.50 |  |  |  |
Warrants, exercise price | $ 15.75 |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  |  |  |  |  | 108,000,000 |  |  |
Extinguishment of debt, cash paid | 168,700,000 |  |  |  |  |  |  |  |  |  | 116,100,000 |  |  |
Extinguishment of debt, cash paid for shares of common stock |  |  |  |  |  |  |  |  |  |  | 79,200,000 |  |  |
Extinguishment of debt, shares issued |  |  |  |  |  |  |  |  |  |  | 3,643,402 |  |  |
Extinguishment of debt, carrying value at extinguishment |  |  |  |  |  |  |  |  |  |  | 99,600,000 |  |  |
Extinguishment of debt, gain (loss), net of tax |  |  |  |  |  |  |  |  |  |  | (15,200,000) |  |  |
Net cash received from counterparties for settlement of call options and warrants | 22,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding | 7,474,817 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of counterparties remaining under outstanding call options | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, effective percentage |  |  |  |  |  |  |  |  |  |  | 8.90% |  |  |
Interest expense on convertible notes | $ 38,870,000 | $ 28,479,000 | $ 31,633,000 | $ 26,400,000 | $ 28,500,000 | $ 31,600,000 |  |  |  |  |  |  |  |

X
- 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 maximum number of shares that the conversion rate will increase upon the occurrence of a fundamental change, as defined in the indenture. + References No definition available. + Details
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- Definition Common stock must be a price of at least this amount to allow the conversion rate to increase by an amount of shares upon a fundamental change that is defined in the note instrument. + 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 days that the trading price of convertible senior notes must be less than 98% of the product of the last reported sale price of common stock and the applicable conversion rate on such trading day to allow the holders of the convertible notes to convert within the following 5 day period after such occurrence. + References No definition available. + Details
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- Definition Represents the number of days that the holders of convertible notes may convert their notes due to the circumstance where during a 10 consecutive trading day period the trading price of the convertible notes was less than 98% of the product of the last reported sale price of common stock and applicable conversion rate on such trading day. + 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 price per share that we will be entitled to receive if we opt to exercise the call options of the 2015 notes hedge. + References No definition available. + Details
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- Definition Number of shares that is the basis for the amount of cash that we are entitled to if we exercise the call options in the 2015 notes hedge. + References No definition available. + Details
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- Definition The fair value of the 2015 notes embedded conversion derivative at the time of issuance of the 2015 notes. + References No definition available. + Details
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- Definition The number of shares issued to extinguish outstanding debt that has not reached its maturity date. + References No definition available. + Details
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- Definition Net cash received from counterparties for settlement of call options and warrants. + References No definition available. + Details
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- Definition Number of counterparties remaining under outstanding call options. + References No definition available. + Details
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- Definition The principal amount of convertible senior notes payable at the time the securities were issued. + References No definition available. + Details
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- Definition This represents the floor of the measurement to determine convertibility of convertible senior notes. If during any 10 consecutive trading day period in which the trading price per $1,000 principal amount of notes was less than 98% of the product of the last reported sale price of our common stock and the applicable conversion rate on such trading day, the holders of the convertible senior notes may convert their holdings for 5 business days following such 10 day period. + 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 Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + 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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- Definition Contractual interest rate for funds borrowed, under the 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 For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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