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Notes Payable and Amounts Due Under Repurchase Agreements (2015 Notes, 2015 Notes Hedges and 2015 Warrants Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 15, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2010
Debt Instrument [Line Items] |  |  |  |  |
Interest expense on convertible notes |  | $ 28,849 | $ 36,370 | $ 38,870 |
Convertible Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest expense on convertible notes |  | 1,400 | 9,000 | 26,400 |
2015 Notes Embedded Conversion Derivative [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, liability, fair value at issuance |  |  |  |  | $ 37,000
Derivative liability, cash paid to settle conversion premium | $ 25,800 |  |  |  |
September 2015 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of convertible senior notes payable at issuance |  |  |  |  | $ 200,000
Interest rate |  |  |  |  | 3.50%
Deferred financing costs |  | $ 6,800 |  |  |
Extinguishment of debt, cash paid | 48,200 |  |  | 116,100 |
Extinguishment of debt, amount | $ 22,400 |  |  | 108,000 |
Extinguishment of debt, cash paid for shares of common stock |  |  |  | $ 79,200 |
Extinguishment of debt, shares issued |  |  |  | 3,643,402 |
Extinguishment of debt, carrying value at extinguishment |  |  |  | $ 99,600 |
Extinguishment of debt, gain (loss), net of tax |  |  |  | $ (15,200) |
Interest rate, effective percentage |  | 8.90% |  |  |
September 2015 Notes [Member] | Private Exchange Offers [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Extinguishment of debt, cash paid |  |  | 82,900 |  |
Extinguishment of debt, amount |  |  | 69,600 |  |
Extinguishment of debt, cash paid for shares of common stock |  |  | $ 48,200 |  |
Extinguishment of debt, shares issued |  |  | 2,115,055 |  |
Extinguishment of debt, carrying value at extinguishment |  |  | $ 66,000 |  |
Extinguishment of debt, gain (loss), net of tax |  |  | $ (4,800) |  |

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