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Long-term Debt - Loss on debt extinguishment (Details) - USD ($)
$ in Thousands
9 Months Ended
Feb. 12, 2018
Sep. 30, 2018
Gain (Loss) on Extinguishment of Debt [Abstract]    
Loss on debt extinguishment $ (4,300) $ (4,305)
Write-off of unamortized debt discount   2,100
Write-off of deferred loan costs   $ 2,200