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Debt - Schedule of Outstanding Debt Obligations (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 269,305 $ 283,209
Less: current maturities 0 21,276
Long-term debt, net of current maturities 269,305 261,933
Convertible Debt | 2022 Convertible Notes    
Debt Instrument [Line Items]    
Long-term debt 269,305 261,933
Convertible Debt | 2019 Convertible Notes    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 21,276