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Summary of Significant Accounting Policies - Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt (Details 1) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Credit Agreement | Term Loan |  |
Carrying value (par value for convertible debt) and estimated fair value of debt |  |
Carrying Value | $ 136,875 | $ 142,500
Fair Value | 136,875 | 142,500
Senior Subordinated Convertible Notes 2010 |  |
Carrying value (par value for convertible debt) and estimated fair value of debt |  |
Carrying Value | 34,732 | 150,000
Fair Value | 63,990 | $ 237,900
Senior Convertible Notes 2016 |  |
Carrying value (par value for convertible debt) and estimated fair value of debt |  |
Carrying Value | 230,000 |
Fair Value | $ 250,988 |

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