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Notes and Loan Payable and Amounts Due Under Repurchase Agreements (2029 Notes Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2009
Debt Instrument [Line Items] |  |  |  |
Change in fair value of embedded derivatives | $ (543,465) | $ 464,698 | $ (32,321) |
Interest expense on convertible notes | 28,248 | 28,849 | 36,370 |
2029 Notes Embedded Conversion Derivative [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Change in fair value of embedded derivatives | $ 0 | 0 | (3,809) |
Convertible Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense on convertible notes |  | $ 1,400 | 9,000 |
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] |  |  |  |
Debt instrument, face amount |  |  |  | $ 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%
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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