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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring
$ in Thousands
Jun. 30, 2019
USD ($)
Quoted Prices in Active Markets for Identical Assets (Level 1)  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Derivative liability - other current liabilities $ 0
Derivative liability - other non-current liabilities 0
Total 0
Significant Other Observable Inputs (Level 2)  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Derivative liability - other current liabilities 4,244
Derivative liability - other non-current liabilities 9,671
Total 13,915
Significant Unobservable Inputs (Level 3)  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Derivative liability - other current liabilities 0
Derivative liability - other non-current liabilities 0
Total $ 0