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Fair Value Measurements - Estimated Fair Value and Carrying Value of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 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 37,516 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 $ 40,301 $ 40,608