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Convertible Notes (Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 16, 2013 | Jun. 29, 2009
Interest expense related to notes |  |  |  |  |
Additional paid in capital | $ 1,181,230 | $ 1,130,368 |  |  |
Convertible Senior Notes [Member] | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.125% | 1.125% | 1.125% | 1.125% |
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00% |  |
Convertible notes |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Total interest expense on convertible notes | $ 8,302 | $ 7,939 | $ 20,259 |  |
Additional paid in capital | 93,400 | 93,400 |  |  |
Convertible notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.125% |
Interest expense related to notes |  |  |  |  |
Coupon interest | 1,553 | 1,567 | 1,567 |  |
Amortization of discount at an additional effective interest rate | $ 6,749 | $ 6,372 | $ 6,019 |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% | 5.50% | 5.50% |  |
Convertible notes | 5% Convertible Senior Notes due 2014 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.00%
Interest expense related to notes |  |  |  |  |
Coupon interest | $ 0 | $ 0 | $ 3,929 |  |
Amortization of discount at an additional effective interest rate | $ 0 | $ 0 | $ 8,744 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 11.70% |  |

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