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Mandatorily Redeemable Preferred Shares, net - Activity Within the Preferred Share Liability (Details) - USD ($)
$ in Thousands
5 Months Ended
Sep. 30, 2019
Apr. 30, 2019
Dec. 31, 2018
Mandatorily Redeemable Preferred Shares      
Net balance at period end $ 99,268   $ 0
Series A Preferred Shares      
Mandatorily Redeemable Preferred Shares      
Transaction date balance   $ 91,185  
Non-cash interest expense recognized, net of transaction cost amortization 8,312    
Gross balance at period end 99,497    
Less: Unamortized transaction costs (229)    
Net balance at period end $ 99,268