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v3.19.1

Fair Value Measurements - Narrative (Details) | Dec. 31, 2018 | Jun. 30, 2016
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5% Convertible Senior Notes due 2021 |  |
Schedule of Equity Method Investments [Line Items] |  |
Debt instrument, interest rate | 5.00% | 5.00%
7.75% Senior Secured Note due 2025 |  |
Schedule of Equity Method Investments [Line Items] |  |
Debt instrument, interest rate | 7.75% |

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