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Notes Payable and Amounts Due Under Repurchase Agreements (2029 Notes Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2009
Debt Instrument [Line Items] |  |  |  |
Change in fair value of embedded derivatives | $ (464,698) | $ 32,321 | $ 133,968 |
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 |
2029 Notes Embedded Conversion Derivative [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Change in fair value of embedded derivatives | 0 | 3,809 | 0 |
Mandatory Redemption [Member] | 2029 Notes Embedded Conversion Derivative [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Change in fair value of embedded derivatives |  | 3,800 |  |
December 2029 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of convertible senior notes payable at issuance |  |  |  | $ 115,800
Adjustments to additional paid in capital, equity component of convertible debt | 15,600 |  |  |
Deferred income tax liability, equity component of convertible debt | $ 11,000 |  |  |
Interest rate | 5.25% |  |  |
Extinguishment of debt, amount |  |  | 47,500 |
Extinguishment of debt, cash paid |  |  | 74,800 |
Extinguishment of debt, cash paid for shares of common stock |  |  | $ 34,900 |
Extinguishment of debt, shares issued |  |  | 1,629,677 |
Extinguishment of debt, carrying value at extinguishment |  |  | $ 44,500 |
Extinguishment of debt, gain (loss), net of tax |  |  | $ (5,200) |
Interest rate, effective percentage | 11.90% |  |  |
December 2029 Notes [Member] | Private Exchange Offers [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of debt, amount |  | 36,200 |  |
Extinguishment of debt, cash paid |  | 66,700 |  |
Extinguishment of debt, cash paid for shares of common stock |  | $ 23,200 |  |
Extinguishment of debt, shares issued |  | 946,793 |  |
Extinguishment of debt, carrying value at extinguishment |  | $ 34,600 |  |
Extinguishment of debt, gain (loss), net of tax |  | (2,500) |  |
December 2029 Notes [Member] | Mandatory Redemption [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Extinguishment of debt, amount |  | 32,100 |  |
Extinguishment of debt, cash paid |  | 69,400 |  |
Extinguishment of debt, cash paid for shares of common stock |  | $ 24,600 |  |
Extinguishment of debt, shares issued |  | 897,548 |  |
Equity reclassified to an embedded derivative liability |  | $ 58,100 |  |

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