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Debt (Narrative - Convertible Senior Subordinated Notes) (Details) - Convertible Senior Subordinated Notes - USD ($) $ in Millions | Dec. 31, 2016 | Apr. 30, 2013 | Jan. 31, 2012
--- | --- | --- | ---
January 2012 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Coupon rate | 4.00% |  |
Principal amount of notes |  |  | $ 45
Equity component |  |  | $ 10
Effective interest rate of liability component | 9.56% |  |
April 2013 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Coupon rate | 1.25% |  |
Principal amount of notes |  | $ 60 |

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