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Fair Value Measurements - Estimated Fair Value and Carrying Value of Long-Term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Convertible Debt | Convertible Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Carrying value | $ 0 | $ 268,780
Secured Notes | New Building Note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Carrying value | 37,679 | 36,528
Fair Value Measurements Level 2 | Convertible Debt | Convertible Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Fair Value | 0 | 334,800
Fair Value Measurements Level 2 | Secured Notes | New Building Note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |
Fair Value | $ 40,461 | $ 40,608

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