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Summary of Significant Accounting Policies - Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
2018 Credit Agreement | 2018 Term Loan |  |
Carrying value and estimated fair value of debt |  |
Fair Value | $ 132,188 | $ 136,875
Carrying Value | 132,188 | 136,875
Senior Convertible Notes 2016 |  |
Carrying value and estimated fair value of debt |  |
Fair Value | 238,625 | 262,775
Carrying Value | $ 230,000 | $ 230,000

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